Malicious PDF — malware analysis report

Static analysis result for SHA-256 214c22089a938736…

MALICIOUS

PDF

79.3 KB Created: 2021-03-01 07:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b15ec83551303ab0f79b7868514f1d30 SHA-1: 121f8d33b69fc4eefe8ece76394ee1e5828b2ada SHA-256: 214c22089a9387367272abf3832652db11e35031cfcb00b91ca281bf8c0c32f8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, forming a link farm. The primary URL, https://ponafet.ru/strik, appears to be a lure to direct users to this network of potentially malicious PDF documents. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to drive traffic to malicious content, likely for SEO poisoning or to host further malware. The ML classifier strongly supports the malicious verdict.

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 https://ponafet.ru/strik?utm_term=que+significa+la+linea+del+destino+en+la+mano
    • http://zuxenegobepejij.22web.org/integers_and_absolute_value_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe8a87698070.pdf
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff0427f733a5.pdf
    • https://cdn.sqhk.co/mojupesonon/id0ujjw/kamevoke.pdf
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5ffe0147e50d0.pdf
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ffaeee85f470.pdf
    • https://cdn.sqhk.co/lagidexetin/jcBhhg1/best_retro_space_shooter_games.pdf
    • http://bixuvetojotenes.22web.org/cheat_code_super_mario_bros_nintendo.pdf
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/jipagulobajelebali.pdf
    • https://cdn.sqhk.co/vawadawuleja/hzhhRkj/wigorazo.pdf
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ff967d52b315.pdf
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fe927f48c838.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/00f8263e3d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb74.bin
5776b112f4100b114543eb1550f85b2b2a36ef54febd4f457ea62b28d5f340c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 5188 bytes
font_01_sfnt_off0000fd0b.bin
ffb5872f206a9b3e6124a188c6253e90b05b1ad030a32115778bb9b96a9da5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10744 bytes
font_02_sfnt_off00012026.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 4324 bytes