1 INTRODUCTION  
2 MALICIOUS URL DETECTION  
2.1 Overview of Principles of Detecting Malicious URLs  
2.2 Problem Formulation  
3 FEATURE REPRESENTATION  
4 MACHINE LEARNING ALGORITHMS FOR MALICIOUS URL DETECTION  
5 MALICIOUS URL DETECTION AS A SERVICE  
6 PRACTICAL ISSUES AND OPEN PROBLEMS  
7 RELATED SURVEYS  
8 CONCLUDING REMARKS