More than half (56 percent) of all risky websites end in .com, says McAfee.

According to the security firm's fourth annual Mapping the Mal Web report, 6.2 percent of websites are dangerous, that's up on 5.8 percent last year.

Vietnam (.vn) was named the most riskiest country-level domain, with 59 percent of all the country's websites being ranked. Meanwhile, Japan (.jp) was name the safest country-level domain for the second year in a row.

"This report underscores how quickly cybercriminals change tactics to lure in victims and avoid being caught," said Paula Greve, director of web security research, McAfee Labs.

"Last year Vietnam's .VN was a relatively safe domain, and this year it jumped to the third most dangerous domain. Cybercriminals target regions where registering sites is cheap and convenient and pose the least risk of being caught. A domain that's safe one year can be dangerous the next."

The security firm also revealed .sg (Singapore) became safer this year, dropping to the 81 from 10 in last year's report. McAfee said this is because documentation is needed to register any .sg site, which means cybercriminals shy away from using the domain.

The security firm advised web users to use reputable, actively updated security software with advanced malware detection and prevention.

See also: The 17 most dangerous places on the internet