Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e2324ea434e180…

MALICIOUS

PDF

80.0 KB Created: 2021-04-26 01:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20fd254dd006cbab2293edbe18ad59d5 SHA-1: 7ecca66409e7ebae21ba4fd92bdf4ed9b7d68f70 SHA-256: a4e2324ea434e180366b5367ae078742765edae89b91e83162501371e4ff71a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jacksth.ru/strik?utm_term=romeo+and+juliet+movie+2013+age+rating PDF link annotation
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/supijusinufuxemomoj.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/sukuxetikinijeradufopav.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/dilamevizoburipuvajesupam.pdfIn PDF document text
    • https://xawaviwuxuj.weebly.com/uploads/1/3/4/2/134235980/ad77c4cfd0.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/07c04003-a0b7-4730-8219-e3bb8efad614/building_structures_illustrated_francis_d.k._ching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85dda8ee-8336-475e-98ad-6ec9b519e8ab/what_is_the_difference_between_a_team_lead_and_a_supervisor.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_a26628679b9645b08d71567ac883ff97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc928e5c-9276-405b-b281-4d599ddbc3da/89437796870.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/bhajan_video_in_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf38351-7ae3-492a-859b-980ae12e56e3/top_books_for_analog_circuit_design.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_9d1c43be992e4363b2a26f2e8215b60d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/82382445952.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_61bf3d8e4fc2475a8d83fe252275385c.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_5f14991d5bc9433b9475d698825d4a50.pdf?index=trueIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_fffaaa938d7840fdb5b95bb218853b89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/3405144816.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/excel_sum_indirect_different_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/best_digital_photography_courses_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/93399880365.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/sesutepugedekegefo.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/minecraft_pe_mods_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f059960c-8493-49e2-bc23-6e30192fb0e4/does_apple_watch_have_weight_lifting.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_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 5600 bytes
SHA-256: b25eabd7ac6a165c497add720660ccbde8d688295dfdd5229ae0fc8e963d514a
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 10692 bytes
SHA-256: c1c93a29ffbc3c19fcbdcd64aadcfc78a12aeb74e6b3a8de1fc1aa00088e7bec

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