Sorry, new to this game: and a guess. At the risk of going out on a complete limb, I think the answers so far are too old; the wing planform looks decidedly Il-62ish, and the engines arranged in a sort-of Kuchemann carrot way makes me think that this a mid-70s rough Illyushin sketch for a Soviet widebody, predating Il-86 CAMBER. No idea what the designation would have been, though.
(So will someone please put me straight - this is Pprune, after all!)
S41