Freedom, even though the IP is likely spoofed I did a check on ARIN Whois, which sent me to LACNIC.
Apparently the spam originates in Brazil, if this is to be believed.
e-mail: abuse at gvt dot com dot br
You can always send the spam message with all the headers to that address.
I start any searches with ARIN using the last IP address listed "from" (though I didn't do that with yours), and copy and paste the IP address in the upper RH corner here: https://www.arin.net/
It's fun!
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