Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a58d364eaf3388…

MALICIOUS

PDF

18.9 KB Created: 2019-05-07 04:28:47 +01:00 Authoring application: mPDF 5.7
MD5: 7fba3dcdf0c05c7e9fabad9216d43d75 SHA-1: 15459dfba186b416d6b364be1c5bd1ca35533fd1 SHA-256: 62a58d364eaf3388df684676f04523ff5974c99c437350818d5c6e37cb22c16a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, identified by the PDF_SEO_LINK_FARM heuristic. While the document body is heavily obfuscated, the presence of a link farm suggests an attempt to manipulate search engine results or distribute content through a large number of seemingly legitimate links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://muicuiu.dumb1.com/8a01a07a02a05a03/Sherlock-Holmes-The-Adventures-of-Sherlock-Holmes-Short-Stories-Collected-Illustrated-and-Annotated-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/9a08a05a02a05a08/The-Adventures-of-Sherlock-Holmes-by-Sir-Arthur-Conan-Doyle-Illustrated-Delphi-Parts-Edition-Sir-Arthur-Conan-Doyle-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/7a07a03a03a00a04/The-Adventures-of-Sherlock-Holmes-Sherlock-Holmes-The-Definitive-Collection-3-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/8a08a03a09a02a01/The-Adventures-of-Sherlock-Holmes-Sherlock-Holmes-3-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/5a09a03a01a09a01/The-Return-of-SHERLOCK-HOLMES-A-Collection-of-Holmes-Adventures-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/1a00a02a02a01a02a07/Sir-Arthur-Conan-Doyle-s-The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/5a09a03a04a08a08/The-Adventures-Of-Sherlock-Holmes-Vol-1-3-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/5a08a08a08a06a07/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/8a06a08a08a03a04/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/7a02a09a03a00/The-Adventures-Of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/4a05a04a01a00a03/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/5a02a04a04a05a04/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/3a02a07a02a09a08/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/3a04a03a05a08a06/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/1a00a08a03a07a06a05/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/2a05a09a08a06a05/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/9a06a02a03a05a07/The-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/1a01a00a06a04a05a01/The-Adventures-of-Sherlock-Holmes-The-Best-of-the-Classics-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/5a04a01a07a01a07/The-Adventures-of-Sherlock-Holmes-Annotated-by-Arthur-Conan-Doyle.pdf
    • http://muicuiu.dumb1.com/1a00a04a06a01a01a05/The-Great-Adventures-of-Sherlock-Holmes-by-Arthur-Conan-Doyle.pdf

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