Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9eea22a2e45d76…

MALICIOUS

PDF

36.1 KB Created: 2020-06-22 18:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efccc25f84ef5859d0be44647f33b36f SHA-1: 8e423b4bd28d391f5212eb974a64e5fdbbf67637 SHA-256: 8c9eea22a2e45d7605e1b633f8104264e58214006cc48e0085170f00f42aa47e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious and contains a significant number of external links, characteristic of a link farm. The document body, though partially obfuscated, contains URLs that are also present in the heuristic findings. These links likely serve to distribute additional malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://marbledsilkartbyc.com/uploads/1/3/0/4/130488861/130488861.html#newmarket+pool+swimming+lessons
    • http://webdisk.ferrarasupply.com/uploads/1/3/0/6/130621142/vuwani.pdf
    • http://stealamoment.com/uploads/1/3/0/8/130874679/migumizugewob_tivodeveb.pdf
    • http://ark.lovegodblesspeople.com/uploads/1/3/1/6/131637148/24568c8b.pdf
    • http://garyhaakenson.com/uploads/1/3/0/5/130543261/gamajavadebajibamopo.pdf
    • http://cpanel.roanyscollectibles.com/uploads/1/3/0/2/130289171/lufisetuxododikupafo.pdf
    • http://trispotcoaching.com/uploads/1/3/0/4/130489122/3478453.pdf
    • http://rebeljmarket.com/uploads/1/3/0/6/130639983/10e2a37a82.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f0f.bin
6d2a81ae3f7bc2ce646383519a3f6b3563060fbf37dd2daa13ecf733b2dd0051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0F 5052 bytes
font_01_sfnt_off00006030.bin
775f9e5ea42a3ca8acc3a9baa91f14b6b77df0f8efbe7e56facd12313d0dc4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 10556 bytes

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