Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c434c9ad1e7c96…

MALICIOUS

PDF

72.4 KB Created: 2021-03-07 00:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3055763b0b901faad94aa065bf32a966 SHA-1: cb9bb71288da3bd01d82f808c09f28558472bb42 SHA-256: 98c434c9ad1e7c969d32f0a55e5867ac53142f166e5cb3693d617f52a7eaa442
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'jumiwimov.ru', suggests it functions as a downloader or redirector for malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links imply an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wb?keyword=november%20schedule%20for%20tcm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414335/normal_603de363b9db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb483b292b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/hi2UAic/nejevozom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_60199ca94eab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_6040dfecaaad1.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/bheicWf/68693240118.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/IvbjfLJ/la_reina_del_sur_2_cast_sofia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fd1451276200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_6006ec78734bb.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/3iaY6ia/crowd_city_game_download_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_602e129b38c9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_600844567b973.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/TMYWszi/black_beauty_original_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_601d910b51309.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/viking_hot_tubs_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5ffcfdbf34d63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5ffda02ec806a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafogaz.rf.gd/leap_2025_algebra_1_practice_test_answer_key.pdfIn PDF document text
    • http://doruxexim.epizy.com/pematotim.pdfIn PDF document text
    • http://pelubameta.epizy.com/46902695022.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/how_long_cook_chicken_in_rotisserie.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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 5220 bytes
SHA-256: 7bbad4c0e2cc7f191aa27603e4baad17970eb3acea5fc8cddbad684983b2866d
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10460 bytes
SHA-256: 41026e4175082c34e0f0db876b75a613a781752deb0b509563117c36921b5948

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