Spam Amazon Invoice

There is another new spam. I received two identical invoices from what appeared to be Amazon with a price I did not recognize (clue 1). They were sent about half hour apart to an email that I do not use for Amazon (clue 2). There was no item description (clue3 ). It was from ar2-amazon@uni-bielefeld.de, weird email (clue 4). Tried to get me to open up PDF invoice (clue 5). The major number of spams ask to open a PDF, or other attachment. Always bad, as that is where they can take over your computer.
Checked Amazon and indeed, no items with that charge (clue 6).

I googled the email and the suffix was from a German college (clue 7).
Immediately deleted. Caveat Emptor!

More - One new scam tactic uses your bank's real phone number to encourage you to surrender your PIN. It starts with the scammers calling your phone claiming to be your bank. They explain that someone has attempted to use your card in a faraway location. When you tell them it was not you, they will claim to block the transaction and ask for your member number. They can use this number to reset your bank account password and trigger a verification code text that is sent to your cellphone, so you believe it is real.