Even though this photo is regarded as a hoax, the origin of the it has never been established. At least not as far as I know. 
But you can find a good article about this photo and the different explanations for it in "My Strange Blog":
I am pretty satisfied that the alien is in fact a monkey and that the photo is some sort of ‘fraud’. I put the word fraud in quotes though,
because it’s still not clear to me what the real fraud is. Nor is it clear to me, who perpetrated it or for what exact purpose.
If it was the work of a bunch of pranksters, who were they? Did they make the photograph in response to a certain flying saucer flap in order to add
to the fun?
Or was this photograph the brainchild of some government agency? If so, which one? And even more importantly, why did said agency take such a photo
and distribute it? What was their gain? Was this a piece in a larger disinformation campaign — for what purpose?
A few questions have been answered for me in my quest to learn more about the history of my favourite ‘Martian photo’ and yet many more questions
remain.
Read more here (the article is in two parts):
mystrangeblog.com...
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