Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8066587ecde016…

MALICIOUS

PDF

95.9 KB Created: 2021-06-11 16:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 019bb55478404a8fbc3299e13a2c4230 SHA-1: a9a341415d5c456b69598272d4a66a14009ae96d SHA-256: 0a8066587ecde016304877e85f90d2f2e6e14cd3cb03e48462b12c5babbe6267
166 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for malware installation. The document contains numerous embedded URLs, including one pointing to 'golowaki.ru', likely serving as a redirector or part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/123?utm_term=afili+ask+episode+2+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd7eacec43c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6035dc8f35485.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408983/normal_60b25806a7c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_603f41b736b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_6023fbdd927d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601744333ee40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd64a044fdf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5fc6d76204abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_605e13d24e767.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://rukuvekuke.pbworks.com/w/file/fetch/144843705/vilegowaduki.pdfIn PDF document text
    • http://gopidam.pbworks.com/f/reported_speech_online_exercises_for_class_9.pdfIn PDF document text
    • http://sapixesut.pbworks.com/f/vocabulary_workshop_level_c_unit_12_completing_the_sentence_answers.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428631/marketing_segun_stanton_etzel_y_walker.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/f/ruzexupivasorofojulamib.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144560577/volume_of_a_cylinder_in_gallons_per_inch.pdfIn PDF document text
    • http://buvulareka.pbworks.com/f/5874276703.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/idle_heroes_redeem_code_april_2020.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144502197/59457600121.pdfIn PDF document text
    • http://gamanovu.pbworks.com/w/file/fetch/144928617/20842755927.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144609444/pemetopip.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/jikukofeze.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144464355/pinafinesit.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/vikings_season_6_episode_2_recap.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/gta_5_cso_file_free_download.pdfIn PDF document text
    • http://zuguwar.pbworks.com/f/25108202002.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 5416 bytes
SHA-256: 36b79be9912f509ce34a4fa0658fbfb6d838cbfe0edec26e2a07d3447a1a5005
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 14236 bytes
SHA-256: 6ceab46c65162a3feadd597ae383ae43bd7f319d7f59ab663e4570b72e4c3718
font_02_sfnt_off00014c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2D 16308 bytes
SHA-256: 8b06eef8fe4ef30ea38039244768d4b9d2eb5dff6252cc2b5caf16b4ef69502f
font_03_sfnt_off000161bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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