Malicious PDF — malware analysis report

Static analysis result for SHA-256 861376db9637da25…

MALICIOUS

PDF

17.7 KB Created: 2019-04-25 00:47:57 +01:00 Authoring application: mPDF 5.7
MD5: 8c0c30c9b6b6f33653b0b3fac88582e7 SHA-1: 73555a314beeef6debaef4794750f44bdeff50d2 SHA-256: 861376db9637da2592b34da4f6b424a3e290b6c4518bc7a60bac837521b59beb
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded URLs, forming a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a technique to distribute links to external content, likely for SEO manipulation or to host malicious payloads. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, but the primary attack pattern is the distribution of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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/3a03a07a01a05a09/Robert-B-Parker-s-Little-White-Lies-Spenser-45-by-Ace-Atkins.pdf
    • http://muicuiu.dumb1.com/3a09a00a06a08a07/Robert-B-Parker-s-Wonderland-Spenser-41-by-Ace-Atkins.pdf
    • http://muicuiu.dumb1.com/3a04a08a07a07a09/Robert-B-Parker-s-Kickback-Spenser-43-by-Ace-Atkins.pdf
    • http://muicuiu.dumb1.com/9a03a01a00a07a02/Spenser-und-das-gestohlene-Manuskript-Ein-Auftrag-f-r-Spenser-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/4a00a08a03a05a03/Stardust-Spenser-17-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/1a02a04a07a03a07/Valediction-Spenser-11-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/4a03a06a03a05/Ceremony-Spenser-9-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/4a03a06a04a01/Early-Autumn-Spenser-7-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/2a03a00a07a05a05/Double-Deuce-Spenser-19-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/3a00a03a07a07a09/School-Days-Spenser-33-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/3a06a02a03a00a09/Double-Deuce-Spenser-19-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/4a03a00a04a09a03/Hush-Money-Spenser-26-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/1a06a05a08a03a07/Hundred-Dollar-Baby-Spenser-34-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/9a04a07a01a00a06/Der-gute-Terrorist-Ein-Auftrag-f-r-Spenser-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/2a08a08a00a08a09/Pale-Kings-And-Princes-Spenser-14-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/1a00a03a09a02a03a01/Hundert-Dollar-Baby-Ein-Auftrag-f-r-Spenser-by-Robert-B-Parker.pdf
    • http://muicuiu.dumb1.com/1a01a04a03a08a02a03/Atkins-for-life-dauerhaft-schlank-und-gesund-mit-einem-6-Monats-Plan-und-vielen-k-stlichen-Rezepten-noch-nie-war-abnehmen-so-einfach-by-Robert-C-Atkins.pdf
    • http://muicuiu.dumb1.com/5a02a08a08a05/White-Shadow-by-Ace-Atkins.pdf
    • http://muicuiu.dumb1.com/6a00a03a09a04a07/Una-and-the-Red-Cross-Knight-and-Other-Tales-from-Spenser-s-Faery-Queene-by-Edmund-Spenser.pdf
    • http://muicuiu.dumb1.com/1a01a03a03a06a00a01/40-Vegetarische-Low-Carb-Rezepte---auch-geeignet-f-r-Atkins-Dukan-amp-LOGI-by-Atkins-Diaetplan-de.pdf
    • http://muicuiu.dumb1.com/2a03a00a07a05a05/Double-Deuc

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