No such thing as an online "job" - for anyone. They're all scams.
Since this is under Study Abroad, beware, since student visas severely restrict or outright prohibit work by foreign students. This includes self-employment, working from home, telecommuting for an employer in your own country, etc. If you were in the US, for example, the tax consequences are even more severe than visa violation consequences - tax fraud, tax evasion are felonies so prison (3 years is a common sentence) before you get deported. But the US is hardly the only country where you'll lose your visa for working.