Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3352df83d0c12c…

MALICIOUS

PDF

87.3 KB Created: 2021-06-07 13:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7ee67e47fec920741097c66df8017ab3 SHA-1: 0a31864f90484b48cc744ce74d35a68581b0eb87 SHA-256: fa3352df83d0c12c48f25315fbce995a248273c848041ee8313720e9df109193
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous links and the heuristic findings point towards a malicious document designed to trick users into visiting external sites.

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://oniceh.ru/pbw?utm_term=determiners+worksheet+for+class+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5fd2eff22beaf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455207/normal_60aff17eeecb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447107/normal_604024c82bc91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_602b3aecaa5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_60b9f50dda492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_602226fa682b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_60463b14918ea.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/e821b73d-510b-4a38-9253-ae9f4b8ac15e/canon_speedlite_580ex_ii_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bddb8c-b541-4206-8b61-9a55efaa0544/7078151512.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/sizodajexawunot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae27ad5f-2963-45c6-be5c-36f89f7bdfd4/nufigajuku.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144639126/xivutofedeger.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/what_the_number_10_mean_biblically.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/59772433515.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/w/file/fetch/144738900/happy_wedding_anniversary_day_photos.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/pemagamelegulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb050ca6-fdb7-44b1-a71a-be8afef2af7f/a_christmas_carol_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b925cf01-b8e3-4aca-a2c1-c2288d0dea5c/kekemosipenuvoxegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7f9012-1c8f-4ee4-9d37-9dfaba645f5c/could_it_be_magic_movie.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_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 5364 bytes
SHA-256: 3987301557b63f4a9193e6a3f60630bc498332539c72670a8b5a57439131a768
font_01_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 10812 bytes
SHA-256: 7983d64242c5b7f1a9573dca47fdbde333d00b9bb3bab5535b60acc7c675ac03

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