Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7476701fdfe9b0…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 22:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88a146d7efd34624985066fb3ef122ce SHA-1: 978d015e01f5ac0c432633fa73bdfd20c9a44aff SHA-256: 2c7476701fdfe9b0b521c628d4b6c4519b9b001ee6a0690abce86bc0a1fc706a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'mezovuduw.ru', suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a network of disposable hosting for link aggregation.

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://mezovuduw.ru/wix?keyword=miracle+whip+antenna+counterpoise PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369768/normal_603f241d991ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6013da5bd0e3a.pdfIn PDF document text
    • http://gmetry.online/wefitovenosutifojajixej7thh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_60247072c32f7.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/hgfbheG/find_friends_phone_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_6022dac58ecab.pdfIn PDF document text
    • http://vkrowl.com/ice_breakers_cinnamon_gum_nutrition_facts2u5xu.pdfIn PDF document text
    • http://tarofolezebinu.iblogger.org/balance_sheet_proforma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_603ee9b045a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5fdbdb378178d.pdfIn PDF document text
    • http://snatural.space/kubuwulisuseravolikew17rwv.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/j0hfiyq/nfl_fantasy_football_rankings_week_12.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/xewipuxikofop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_600479caa7e37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaad22f-16d0-43f6-b7fd-8211b4c7233e/vilima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdcbefc-e156-44ec-9ee6-d854572d4b0d/jidonigawuz.pdfIn PDF document text
    • http://togejemalaf.epizy.com/geferajokodejoziv.pdfIn PDF document text
    • http://mavuginogafesu.epizy.com/wuvunoluwamirorala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4988fd22-82f0-4f71-853d-de14341056bb/78592951886.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5120 bytes
SHA-256: f76e751b497a23b032c311a0c049bc6a7c0370b73b49b31c62a6914c7a4af87a
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10684 bytes
SHA-256: 738446b3883fd3d41953d17881ee7a0017c25039727f7a672d03df7fa5f60dcc

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