Malicious PDF — malware analysis report

Static analysis result for SHA-256 6725bbe20d1a8234…

MALICIOUS

PDF

69.7 KB Created: 2021-01-16 21:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 873e4d1bdd385a567b72a008159431c8 SHA-1: 17121cd57c489be552b7a025e2f202e8c7186253 SHA-256: 6725bbe20d1a82343a623f4f5b3b0cadea93cdf65ba5cc2ccdad686634bbdaba
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'trafffi.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=instax+mini+8+film+cvs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f964d716d558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fec0be29a8ab.pdfIn PDF document text
    • https://site-1178514.mozfiles.com/files/1178514/wamatajidanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fbc79ac099bc.pdfIn PDF document text
    • https://site-1174086.mozfiles.com/files/1174086/major_lazer_light_it_up_remix_instrumental.pdfIn PDF document text
    • https://site-1228360.mozfiles.com/files/1228360/73758493703.pdfIn PDF document text
    • https://site-1198654.mozfiles.com/files/1198654/survival_island_evo_pro_free_download.pdfIn PDF document text
    • https://site-1176254.mozfiles.com/files/1176254/96883139679.pdfIn PDF document text
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/61edb3813a6e463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ffa0cdfdc65a.pdfIn PDF document text
    • https://vavuxajibibugu.weebly.com/uploads/1/3/4/4/134472661/disemil-xizivu-nosoxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5fdb980689190.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdfIn PDF document text
    • https://site-1174838.mozfiles.com/files/1174838/minecraft_monster_school_plants_vs_zombies_2.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/tamokitukizi-lejinuginamep-bigotoj.pdfIn PDF document text
    • https://site-1166655.mozfiles.com/files/1166655/taxirod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 4748 bytes
SHA-256: a3e4d871561a618e798079ebe011dfe866da90ba238f2318a5c9fa4f4f12d1af
font_01_sfnt_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 10796 bytes
SHA-256: b376b52aaaacfeb3a8c6d23ec7d8e850cca79b8e5f597a1c3a59c7789ce9690d
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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