Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5845bdc4f53e0b…

MALICIOUS

PDF

30.8 KB Created: 2020-04-11 01:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3078a46222a9d516968042639010c629 SHA-1: 6336d79778a7aa75bd7b9c8a6364c24c53cf0829 SHA-256: 6b5845bdc4f53e0b22087435bcdae554473dfebd54b7d7d09a086e1815d176fc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to further compromise.

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://74-123-73-226.mgwnet.com/uploads/1/3/1/4/131406806/131406806.html#quantitative+analysis+for+management+solution+manual
    • http://nickskitchendalycity.com/uploads/1/3/0/6/130604694/jejem.pdf
    • http://narlee.design/uploads/1/3/1/3/131382081/9274272.pdf
    • http://thepurposechurchseattle.org/uploads/1/3/0/6/130621575/vulenejutonobud.pdf
    • http://auroracinemaproduzioni.com/uploads/1/3/1/0/131069839/e16ad60e.pdf
    • http://kambellishments.com/uploads/1/3/1/3/131398254/kasizejoluz-nunipulexajan-vibomasas.pdf
    • http://empire91.com/uploads/1/3/0/2/130271157/3600951.pdf
    • http://medicalaccesstutoring.net/uploads/1/3/1/4/131437409/daxizazeranapunetid.pdf
    • http://wkndvan.life/uploads/1/3/1/3/131379189/72b59a46bf.pdf
    • http://allaboutyourskin.com/uploads/1/3/0/6/130621732/jezapi_nisagabene_xoriz.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e32.bin
3a95076d8db587b122c57b33a63206886ff670c93f01914553a2478e56ed27ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E32 7816 bytes

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