Is this attack, apache failed every time, here is log...

Every time when I restart apache in WHM I have error:
httpd has failed, please contact the sysadmin.

Here is few lines from apache error log:
tail -n 200 /usr/local/apache/logs/error_log | more
[Tue Jun 14 07:45:26 2005] [error] [client 68.97.135.165] Invalid method in request 4VxfyI1Gmxpllj6Aso8QFaxfvQyGjanRqVw1A6W46Q3OKn9K0qBA65L5McBChzFCs9RY
[Tue Jun 14 07:45:26 2005] [error] [client 218.251.52.194] Invalid method in request 27xJE9Q5RLzhOExPS9PbWZS
[Tue Jun 14 07:45:26 2005] [error] [client 218.251.52.194] Invalid method in request LpXV0rRLwzhuse6vbVnV7R8bmjCR5Y8DvuaoIcuq2jqZ8uaVA9BOfDkOG0GBN4IZnd
[Tue Jun 14 07:45:26 2005] [error] [client 61.183.73.248] Invalid method in request 4a04onwpjtSHylK6kbISiEfTaboyCQsoE2Ah7XI
[Tue Jun 14 07:45:26 2005] [error] [client 61.184.42.195] Invalid method in request Kdlthkfz
[Tue Jun 14 07:45:26 2005] [error] [client 68.125.142.181] Invalid method in request TSlynfqF5xohKgr94ygyvKy5cW7m9hFuCsxvu80scshHTXyjGAn9q
[Tue Jun 14 07:45:26 2005] [error] [client 61.184.42.195] Invalid method in request SP2P5qh6UDhzfe0F6lJF
[Tue Jun 14 07:45:27 2005] [error] [client 222.144.105.233] Invalid method in request ydJMtcPb5BITtfFi68RygBsKj9l2gh
[Tue Jun 14 07:45:27 2005] [error] [client 68.125.142.181] Invalid method in request f1h0aatnquiKpvXsuye6cmT76xEGc3db2
[Tue Jun 14 07:45:27 2005] [error] [client 222.144.105.233] Invalid method in request oXbMnQdHUGpgVDeapwWH53cByuwTYXGql5oXxu71XymaBYJXXnSMWdD0xGzwdZsOilucjPh
[Tue Jun 14 07:45:27 2005] [error] [client 200.35.231.160] Invalid method in request OCltHc2p7r9kH5pZ5kwzpVjvMcUxIuKqpblVizrj4aQtl5LS9zlvvSZsqMwC3LAzxJe1b
[Tue Jun 14 07:45:27 2005] [error] [client 200.35.231.160] Invalid method in request 0qY0Vzuv
[Tue Jun 14 07:45:28 2005] [error] [client 219.110.63.197] Invalid method in request Zg7UHzmHLKSB3mBN9Aw8BPaaNdjynWLZBijnxJsH8zbwlsT8nmHpyr5sogQQ7fWjqN8aoTE
[Tue Jun 14 07:45:28 2005] [error] [client 219.110.63.197] Invalid method in request oFTTwyq4nWjmA50n5jh7ir1tji2vCPMJoU5tU9DVMP3aEKLhwAXrVYc0WW5L1FV6vJhuiV
[Tue Jun 14 07:45:28 2005] [notice] cannot use a full URL in a 401 ErrorDocument directive --- ignoring!
[Tue Jun 14 07:45:28 2005] [error] [client 12.2.39.8] Invalid method in request lDvx2fFFnafnu0z
[Tue Jun 14 07:45:28 2005] [error] [client 70.187.212.52] Invalid method in request NMiH5CImC6VusF6KZcSRKj6kBvGmAHtTz61E
[Tue Jun 14 07:45:28 2005] [error] [client 70.187.212.52] Invalid method in request nBPC0OJyarfPBOiVxWVQ02aT9d

(only few lines)

How I can fix this, is this attack? How I can stop this?

Thanks.

 

 

 

 

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