Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac08aafadd6c61eb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 11:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0a80449823f08588c934ba97b8e4a3e7 SHA-1: 1d61f8942f428b99ad1e2dbddd55e6e2983fcc53 SHA-256: ac08aafadd6c61ebb6db31888e2e4854d2c75b0ff47a90ef13f9eae8b95cc189
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, though partially corrupted, suggest a phishing or scam attempt by directing users to external sites. No scripts were extracted, but the PDF structure itself contains numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+use+crane+drop+humidifier PDF link annotation
    • https://cdn.sqhk.co/retagigimusa/dDQVibF/tebilikige.pdfIn PDF document text
    • http://zurabutodiriwa.22web.org/cuneiform_bone_and_heel_pain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6027aa195607c.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/jciauSV/ode_to_autumn_poem_summary.pdfIn PDF document text
    • http://bofasojeg.iblogger.org/9511781153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6032a4ac0d1ec.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/3ig0Ahg/amazon_music_unlimited_family_plan_vs_individual.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/jdHhhii/18921693679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomematomeze.epizy.com/buku_amdal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd1a3b7-6a37-4762-8a92-7224618effd8/how_much_do_general_managers_make_at_planet_fitness.pdfIn PDF document text
    • http://xomeluwika.rf.gd/palogizubagijakozul.pdfIn PDF document text
    • http://biguwaximi.epizy.com/jesus_the_same_chords.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_bf70d53b3e954c6eb5d429f65c10093c.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_66a92db13d4440dd91f12143469be0f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a6256a-7172-4676-8cf8-11179878ca6e/govazero.pdfIn PDF document text
    • http://vibejasejejake.epizy.com/african_anglophone_literature.pdfIn PDF document text
    • http://tuvufuxo.epizy.com/65327960029.pdfIn PDF document text
    • http://nomabatapumijez.epizy.com/fisokibelogazubajido.pdfIn PDF document text
    • http://getakufo.epizy.com/6328635873.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5416 bytes
SHA-256: c08baf7d51a6cdb8e8a7975fed4c9719cff2c9857a4c492ff7dc1965d7b09215
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 11284 bytes
SHA-256: 2df0edc9132e9cdee79154db495ee18373c9d4ef8354ef902812e6fa142ee84f

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