Malicious PDF — malware analysis report

Static analysis result for SHA-256 3546b92fc0fb6724…

MALICIOUS

PDF

16.8 KB Created: 2019-04-29 23:08:43 +01:00 Authoring application: mPDF 5.7
MD5: 79f7f119244499f4d339eec3d9204973 SHA-1: 16b0a329db27976fee06a1822c3c9c65c1f5b2ab SHA-256: 3546b92fc0fb672430598d0724ad92022ffa4f9a4cd34a71d96568b0b2cfcbe5
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed a PDF SEO link farm containing 23 external links, many of which point to PDF documents with book titles. While the specific URLs themselves are currently marked as benign, the sheer volume and nature of these links suggest a tactic to obscure malicious intent or to generate traffic for potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 2

  • 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.
  • 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/7a04a08a05a05a07/Winston-s-War-Churchill-1940-1945-by-Max-Hastings.pdf
    • http://muicuiu.dumb1.com/1a05a07a07a02a00/The-Last-Lion-Winston-Spencer-Churchill-3-Defender-of-the-Realm-1940-1965-by-William-Manchester.pdf
    • http://muicuiu.dumb1.com/5a00a05a00a03a07/Speaking-For-Themselves-The-Private-Letters-Of-Sir-Winston-And-Lady-Churchill-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/7a09a00a09a09a08/Winston-Churchill-The-Incredible-Life-And-Legacy-Of-Winston-Churchill-by-Tom-King.pdf
    • http://muicuiu.dumb1.com/7a09a01a00a00a00/Churchill-s-Hour-Winston-Churchill-3-by-Michael-Dobbs.pdf
    • http://muicuiu.dumb1.com/7a09a00a09a09a04/Churchill-s-Triumph-Winston-Churchill-4-by-Michael-Dobbs.pdf
    • http://muicuiu.dumb1.com/1a05a00a04a00a03/The-Crossing-by-Winston-Churchill.pdf
    • http://muicuiu.dumb1.com/4a07a05a00a03a01/The-New-World-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/4a00a06a07a01/Memoirs-of-the-Second-World-War-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/1a04a03a06a05a02/Winston-Churchill-by-John-Keegan.pdf
    • http://muicuiu.dumb1.com/3a02a04a02a07a07/The-Second-World-War-6-volumes-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/7a09a00a09a06a05/The-Wit-amp-Wisdom-of-Winston-Churchill-by-James-C-Humes.pdf
    • http://muicuiu.dumb1.com/1a03a09a07a09a05/The-Gathering-Storm-The-Second-World-War-1-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/4a02a01a04a06a03/Winston-Churchill-Man-of-the-Century-by-John-Ramsden.pdf
    • http://muicuiu.dumb1.com/1a09a01a01a09a09/Inferno-The-World-at-War-1939-1945-by-Max-Hastings.pdf
    • http://muicuiu.dumb1.com/1a00a02a01a04a09a03/The-World-Crisis-1911-1918-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/1a00a04a07a01a07a05/Winston-Churchill-Ruhm-Und-Legende-by-Dietrich-Aigner.pdf
    • http://muicuiu.dumb1.com/4a06a02a04a01a06/Vietnam-An-Epic-Tragedy-1945-1975-by-Max-Hastings.pdf
    • http://muicuiu.dumb1.com/6a05a02a04a07a08/The-World-Crisis-Volume-I-1911-1914-by-Winston-S-Churchill.pdf
    • http://muicuiu.dumb1.com/8a09a08a01a02/The-New-World-A-History-of-the-English-Speaking-Peoples-2-by-Winston-S-Churchill.pdf

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