Malicious PDF — malware analysis report

Static analysis result for SHA-256 549731eec9e0e152…

MALICIOUS

PDF

36.6 KB Created: 2020-04-30 13:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d6dacca5625003e2fc14fdc2e1795b9 SHA-1: f467741270db31b8109ce9da16932828a0f25930 SHA-256: 549731eec9e0e15239b9498dc33fe13ba1e1d86245424131eecf92a7e9ff3c3e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm designed to host further malicious content. The document body, though heavily obfuscated, contains a reference to 'Bahubali film 3gp video', suggesting a lure to attract user clicks. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-optimized PDF links points towards a distribution mechanism for further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mymissblue.com/uploads/1/3/0/7/130776111/130776111.html#bahubali+film+3gp+video
    • http://allesaker.com/uploads/1/3/1/3/131379236/a4c8be6641.pdf
    • http://txstateacctclub.com/uploads/1/3/0/7/130775244/gepojitobivane.pdf
    • http://drtomfisher.com/uploads/1/3/0/2/130287413/xitomizadulow.pdf
    • http://grantcardonesalestraining.ca/uploads/1/3/0/4/130489297/tofatejeje.pdf
    • http://lgipowerwashing.net/uploads/1/3/1/0/131070236/remabeduwof_fozutusa.pdf
    • http://guardian-claims.com/uploads/1/3/1/6/131606739/dedapijeletuwuzeji.pdf
    • http://phoenixflooringcare.com/uploads/1/3/1/3/131380993/jaleminotarar.pdf
    • http://localdealguide.com/uploads/1/3/1/4/131437756/6714218.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_off00006621.bin
e050db7f58e506d386e0018fcea431dcef17497f33ec56da822425812d972a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 8504 bytes

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