Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ab8665bf121a4…

MALICIOUS

PDF

16.7 KB Created: 2019-05-06 16:33:16 +01:00 Authoring application: mPDF 5.7
MD5: 97455470116017ca93af335f118682f1 SHA-1: e5329669a73084a35211c12447ca84dd973df552 SHA-256: 645ab8665bf121a465fcd6b5329e5cd159b4bdba3e3377d8ea6f04fbf8a91952
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm. While the document body is heavily obfuscated, the presence of numerous URLs suggests an attempt to manipulate search engine results or direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious, supporting the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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/8a00a05a04a04a02/A-Christmas-Carol-Victorian-Carols-with-Readings-from-Dickens-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/1a00a07a05a01a08a05/Charles-Dickens-A-Christmas-Carol-A-Radio-Dramatization-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/9a08a03a04a00a01/Charles-Dickens-A-Christmas-Carol-A-Radio-Dramatization-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/5a09a01a07a09a09/Bleak-House-1852-by-Charles-Dickens-The-Ninth-Novel-by-Charles-Dickens-World-s-Classic-s-Bleak-House-Is-One-of-Charles-Dickens-s-Major-Novels-First-Published-as-a-Serial-Between-March-1852-and-September-1853-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/2a08a07a05a08a07/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/5a06a01a08a06a06/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/7a05a04a01/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/8a01a00a03a06/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/1a01a01a06a00a00a06/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/7a06a00a08a06a05/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/5a05a05a00a05a04/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/1a01a08a07a01a03a02/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/8a00a00a06a04/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/9a01a02a09a02a03/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/6a03a04a01a04/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/7a03a04a09a03a07/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/7a07a07a07a00a08/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/5a06a07a03a07a03/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/6a05a02a02a02a08/A-Christmas-Carol-by-Charles-Dickens.pdf
    • http://muicuiu.dumb1.com/7a05a07a02a00a03/A-Christmas-Carol-by-Charles-Dickens.pdf

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