Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf507c8a4bc6537…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 13:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0584173dfd2f1647c216ea53c1bba3e8 SHA-1: 93b9eb2cca73071c60a11c0a27372717037a2036 SHA-256: baf507c8a4bc65378bf84ccc763a76b140668e735ea80685f88626d50129f62d
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://xezojetit.ru/award?keyword=adobe+pdf+fill+and+sign+online PDF link annotation
    • http://pugisapi.mypressonline.com/what_is_architecture_diagram_of_project.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/jchagdu/world_best_computer_games_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60454399ac8c3.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/hejeihk/arcserve_replication_and_high_availability.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477921/normal_5ff4a5c3db75d.pdfIn PDF document text
    • http://zokoxakabu.medianewsonline.com/543165556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_60297dee0783d.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/fusionner_plusieurs_avec_acrobat.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/iBjcjgL/fire_city_truck_rescue_driving_simulator.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/10090976921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_6036bac443fa9.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/ibhehbp/android_auto_compatible_cars_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_60543f3e64b68.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/ibTjfid/globe_at_home_fiber_change_password.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forojiwimudobo.atwebpages.com/46809824101.pdfIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_074430a0051d438986c38dd43e3ecbca.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/51602519526.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_fb86410b639845bda457a4cb23649b50.pdf?index=trueIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/54063926012.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5244 bytes
SHA-256: 848c33bb9abfde347117cdc3ed817e98f4aa3d68ed3880e5a2f3d46a19269648
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 10556 bytes
SHA-256: f32b7eebbab387646b3582ad09fa345731b283c95b0c1e178ccf7f7d0ed4dc9b

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