Virus

It's not a virus, it's calendar spam.

https://appleinsider.com/articles/19/08/26/how-to-stop-icloud-calendar-spam-and-junk-mail

My inbox is so full of apple phishing messages that its become almost enough to forward all mail to phishing@apple.com to make sure the spammers are eventually blocked

Unfortunately, that will never happen. With trillions upon trillions of possible domain names, they will never run out of new ones to use.

I see a lot of nonsense domains, and the ICANN has not taken any steps to police it either