Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96785af44255e82…

MALICIOUS

PDF

42.9 KB Created: 2020-04-03 09:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1382d0d3ebfd5e9fc16652a2fc682bf3 SHA-1: 635901d4dfa11c7fddee13df331612e4e3e1600e SHA-256: c96785af44255e8260f9d29f196ba6a9813d3d1bbb1f2abc8ab8967cb434440b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains a title related to 'Manual de vacuna ion 2018' and references wkhtmltopdf, suggesting a lure document. The primary attack pattern involves directing users to a network of potentially malicious or misleading PDF content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://deardoc.org/uploads/1/3/0/8/130814286/130814286.html#manual+de+vacuna+ion+2018
    • http://lhathome.com/uploads/1/3/0/6/130639244/2354561.pdf
    • http://silbertnation.com/uploads/1/3/0/4/130476237/4332655.pdf
    • http://oceandevotionusa.net/uploads/1/3/0/6/130639437/4d0df3.pdf
    • http://chordmasters.net/uploads/1/3/1/1/131164246/wulegifijusofofifik.pdf
    • http://hybridmartialarts.org/uploads/1/3/0/7/130739445/denutimiwibil_resasakun.pdf
    • http://ddknitz.com/uploads/1/3/0/4/130483305/1523833.pdf
    • http://poppycoutureboutique.com/uploads/1/3/0/8/130874241/wipomenex-wumisiminimu.pdf
    • http://happybohum.com/uploads/1/3/0/5/130589261/sesexal.pdf
    • http://oracleconsultant.co/uploads/1/3/0/5/130589354/f6b36d86d46.pdf
    • http://shivadream.net/uploads/1/3/0/3/130379479/9670720.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_off00006690.bin
fa435026963c5a1c56fff9195d15840eb2244362cb6c68ca32ea5299f58c95ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 9104 bytes
font_01_sfnt_off000087a2.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 16204 bytes

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