I'm having trouble figuring out what kind of botnet has been hammering our web servers over the past week. Requests come in from tens of thousands of addresses, just once or twice each (and not getting blocked by fail2ban), with different browser strings (Chrome versions ranging from 24.0.1292.0 - 108.0.5163.147) and ridiculous cobbled-together paths like /about-us/1-2-3-to-the-zoo/the-tiny-seed/10-little-rubber-ducks/1-2-3-to-the-zoo/the-tiny-seed/the-nonsense-show/slowly-slowly-slowly-said-the-sloth/the-boastful-fisherman/the-boastful-fisherman/brown-bear-brown-bear-what-do-you-see/the-boastful-fisherman/brown-bear-brown-bear-what-do-you-see/brown-bear-brown-bear-what-do-you-see/pancakes-pancakes/pancakes-pancakes/the-tiny-seed/pancakes-pancakes/pancakes-pancakes/slowly-slowly-slowly-said-the-sloth/the-tiny-seed
(I just put together a bunch of Eric Carle titles as an example. The actual paths are pasted together from valid paths on our server but in invalid order, with as many as 32 subdirectories.)
Has anyone else been seeing this and do you have an idea what's behind it?