Weird email scam,need advice.

So my brother just got a really weird email from a scammer.
it has a document attached which needs a password to open.
However what's really weird about the email is that it contains
his name, home address and his personal email address.

the email comes from a speed.com.ar address.
we are worried as to how they got all this information

Hello,
Just delete the email and ignore the attachment. There are probably trying to get his email password. His information was probably obtained from a public source, especially if he signup on website or put his information on contest drawing. If you read the fine print in most of these you agree so receive emails.