Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9b8be638de752e…

MALICIOUS

PDF

14.0 KB Created: 2019-05-06 16:39:27 +01:00 Authoring application: mPDF 5.7
MD5: eb8786aa06c5e6cb76a58d32bc1e1e44 SHA-1: d7356ada9a6e072fc6d0c9adfe903c53eb02ebb1 SHA-256: ef9b8be638de752e59c9d1dd9d1e25439dcd00b08fc6f30e186123e5604da8eb
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various Garfield comic book PDFs hosted on loaminoo.linkpc.net. While the individual linked PDFs are marked as benign, the sheer volume and structure suggest a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://loaminoo.linkpc.net/2099097095099094/Garfield-Bigger-Than-Life-Garfield-3-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097093098098093/Garfield-Bigger-and-Better-Garfield-30-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/1091097096095097091/Garfield-Bd-6-Garfield-setzt-an-Garfield-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/2093092096098090/Garfield-Food-for-Thought-Garfield-13-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097092098098092/Garfield-Life-in-the-Fat-Lane-Garfield-28-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097093098098099/Garfield-World-Wide-Garfield-15-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097092098097092/Garfield-Older-amp-Wider-Garfield-41-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097094091099090/Garfield-Life-to-the-Fullest-Garfield-34-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097092098098095/Garfield-Throws-His-Weight-Around-Garfield-33-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097092098097096/Garfield-Large-and-in-Charge-Garfield-45-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/8097096090096/Garfield-at-Large-His-First-Book-Garfield-1-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3091098090090095/Garfield-Tips-the-Scales-Garfield-8-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097094092092091/Garfield-Goes-Bananas-Garfield-44-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/6095093098096099/Garfield-Gets-His-Just-Desserts-Garfield-47-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097094091097094/Garfield-Keeps-His-Chins-Up-Garfield-23-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097092098097098/Garfield-Will-Eat-for-Food-Garfield-48-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3091098090093090/Garfield-Makes-It-Big-Garfield-10-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/3097093099090092/Garfield-Thinks-Big-Garfield-32-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/8091090093098095/Garfield-Poids-lourd-3-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/8091090093098092/Garfield-Poids-lourd-1-by-Jim-Davis.pdf
    • http://loaminoo.linkpc.net/8097096090096/Garfield-at-

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