Rogue Hit Machine

I've been getting some really weird referral url's and hit ip's. I keep getting multi hits by the following:

x4-host145.obit.ru

srv001.infobox.ru

http://www.test.com

url's sometimes come up as things like mar04.com, or 40305.com or similar. Has anyone else been getting this? I've also had a load of hits from some sort of game site [gamefrog?], for no apparent reason. Is it to do with the inktomesearch spider? If anyone can shed light, please do.

/confused