Malicious PDF — malware analysis report

Static analysis result for SHA-256 844198b716030e9c…

MALICIOUS

PDF

41.9 KB Created: 2020-04-04 10:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a6ad33854a525fa3d51bbc5ba0b5926a SHA-1: 8a4277a7b9e888db00562200c6938bae624260d4 SHA-256: 844198b716030e9cb81d7807ea8b66b7b9fa0df9c4f607e4c88cbde14bda4318
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains references to these URLs, suggesting a deliberate attempt to direct users to potentially malicious or SEO-manipulated content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jshandymanservicesllc.org/uploads/1/3/0/4/130477135/130477135.html#hidroxido+de+oro+3+usos
    • http://ccl-nyc.com/uploads/1/3/1/1/131164090/pagom.pdf
    • http://chuysrestaurant.net/uploads/1/3/0/5/130550955/tegozirokejulim.pdf
    • http://karintell.se/uploads/1/3/0/5/130551127/wuluv.pdf
    • http://medpointsurgical.com/uploads/1/3/1/1/131164249/pokefetaf.pdf
    • http://quiltwithleslie.com/uploads/1/3/0/5/130590158/wezutejojef.pdf
    • http://juliajack.com/uploads/1/3/0/5/130588702/kavoruvi.pdf
    • http://resonantinterventions.com/uploads/1/3/0/5/130550657/84c939404b6.pdf
    • http://succulentgardener.com/uploads/1/3/0/5/130551176/dukinajazigizom-nudab.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_off0000782a.bin
ca6cd6070941cb295ff5adad984a7c0c7a66a4e64d5aa196fc941dc8a7ab13d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 9400 bytes

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