Malicious PDF — malware analysis report

Static analysis result for SHA-256 310eb2489f169201…

MALICIOUS

PDF

78.3 KB Created: 2021-03-17 16:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c958fc28d30df46e54664340856662c1 SHA-1: 9908f261053f750e930f4446321024a7df89b47d SHA-256: 310eb2489f169201e7a08fe1b8144db6a9ff3b2f763ca298a0eda9041f544267
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=lost+series+1+episode+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385011/normal_6018daf814e58.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/6993354497.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/techniques_d_amlioration_continue_en_production.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_603c501729a53.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/areas_of_compound_shapes_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fd31db721041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_605013999377b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_602080937f975.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/haloalkanes_and_haloarenes_ncert_notes.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/duzunugepobunikawikakuke.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/authorized_kitchenaid_mixer_repair_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_602cae6be6321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff65dade4d73.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
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_7aabab22f24644fa893d6d385ae60023.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_385f5643daad480e875050584d036881.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15aad964-ae53-4278-92b9-0a58d42fa615/how_to_turn_off_sidetone_on_ps4_gold_headset.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/timonuvotavivusizonikev.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_9e6bf53ea9bd47348286f8470d13541a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db8a49e-fc68-4476-94a4-1f256d09c894/ernest_hemingway_books_in_chronological_order.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/what_are_the_five_climate_regions_of_africa.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/wusepu.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/nokonokatarimilimusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214a6c5d-050b-4017-b299-88c4267e41a3/53506869966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f163525a-f41d-46fa-b905-533fec0be973/quadratic_equation_word_problems_with_solution_and_answer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 4656 bytes
SHA-256: 7295b8c385a4d9cc405661ceeb21fb94c070eea23b0aa450886298c0fa37db02
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10572 bytes
SHA-256: ad237bf65ecebb5fa89c53cddeb595733ba5d821158d0d08ce69e31508c11634
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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