Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6350c45d2bc4b36…

MALICIOUS

PDF

89.7 KB Created: 2021-06-10 21:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb93683360c92167558c286d659fc7ef SHA-1: 3e6e05729a120994cff043c372db4c907847969d SHA-256: c6350c45d2bc4b36d65a4946f4e9812b1554ad2c28ef0839b20910ff281950eb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or scam campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://medvor.ru/pbw?utm_term=mgr+sivaji+rajini+kamal+mp3+song+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fc6aa6b8b666.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/piputadaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_6068381b43117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe4073de385e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_604a5d37e8b02.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/mefame-bavaf-fexitevasiwoj.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
    • https://uploads.strikinglycdn.com/files/7a40595c-872f-4f2f-8bd9-e396504c09ad/vupotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195da0ad-1a7a-42d9-98aa-16bbd089e6a7/65441086343.pdfIn PDF document text
    • http://kimiwodevus.pbworks.com/f/87923274051.pdfIn PDF document text
    • http://gijutexamuwa.pbworks.com/w/file/fetch/144646863/ralikolavav.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144451698/how_to_resize_a_photo_to_uk_passport_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eeb4d4e-5fa7-4d5a-8184-a79beaccb7fd/hp_1320n_cartridge.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/wipobogofutamuxelulunebip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64f46fa-a735-42aa-a862-6892dae07768/autocad_student_version_2017_free.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/w/file/fetch/144623433/how_to_conduct_a_disciplinary_appeal_hearing.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/5026138640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa174bd-d3b6-47ad-baa7-82a8b54a2af0/86089205055.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144414993/44500456403.pdfIn 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_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 5328 bytes
SHA-256: d5c62deac355f36f1569a976cb4984a7af37c62e53d16e4bef014b3d1cc0e8c2
font_01_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 11912 bytes
SHA-256: 62fb3a0ceb20c4800961f88fc566eb5d9593bfe771b504493c34641b82f7d801
font_02_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f