You are right, these are hacking attempts. I get many of these mails myself.
These sites generally give you a link and on going there, you are asked to enter your username/password/credit card nos/Paypal details etc.
Never Never Ever give your personal account details to this site. They are not genuine and your details will be misused or sold.
These Phishers ( as these people are called ) mass mail to lakhs and lakhs of people. Many are not aware that this is a not genuine and end up giving all details, and hence land themselves in trouble.
All good sites, like Paypal, Foreign Banks etc, as a rule, will never ask you for your password and other details... So be careful.
Regards