Is This A Scam ?

Yes, that's a fairly common money laundering scam. Typically the 'payments' you receive are stolen funds. Banks are pretty good at detecting stolen funds and tracking them, so it's very difficult to get away with such thefts. And that's why the criminals want to give you the money then get you to send it overseas, this way you're the one who gets caught by the bank. They obviously don't care if you get caught as long as you have time to make a couple of payments first, and then they'll simply find someone else to receive the funds.