Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f98cc67cad8fb7b…

MALICIOUS

PDF

71.9 KB Created: 2021-03-23 09:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b84f996e36d255fbb8c8706d9fdd133 SHA-1: 61cd0097324ad66a2c99686a52f913585f576dd3 SHA-256: 3f98cc67cad8fb7bf0e4753a434311f36c68d8d1e3b4c4be8d0eedf8cabba948
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting it acts as a lure to a phishing or malware distribution site. The PDF's structure and numerous links on disposable hosting further support its role as a malicious document, likely delivered 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://kuzutuzo.ru/strik?utm_term=six+ideas+that+shaped+physics+solutions+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6054c13019a50.pdfIn PDF document text
    • http://delabozaxexiris.getenjoyment.net/anglo_american_literature_grade_9.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/excel_practical_test_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_604422d7d2ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe50dea24e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_601b7af596b97.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hh40jdM/ticket_to_ride_europe_game_board.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fd6f1e1d4c47.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/U8Qghhj/mivemaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_605399209f05d.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/superset_workout_routine_for_mass.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/v_for_vendetta_free_movie_download_mp4.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/tolebukujatipaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380887/normal_5ffda4a0577a4.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/Qjgp90S/algebra_1_identifying_functions_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fe8edd43ced9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/11014294666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0816970a-d77b-4bab-b2d9-20fd4738b9a1/2705935310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5959e6d6-5802-4508-bdae-215ac232932c/dexan.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 5492 bytes
SHA-256: 3433711e6667e72bddfc3ed8077c07a77fd1ac816bedf93d97cbcd5e75be5eab
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 11188 bytes
SHA-256: f239da019cf2c44acdd0556f75a1e2004cb1b0c897c9bbed095bd4fb7a8ded88

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