Malicious PDF — malware analysis report

Static analysis result for SHA-256 315f1eca7f8200e0…

MALICIOUS

PDF

71.5 KB Created: 2021-03-28 05:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f5fbf6d3bbc252e8b0f6d8785836994 SHA-1: 99c98f764ba3bf008277758ce246beca1f2b7613 SHA-256: 315f1eca7f8200e0a33f6fb76493f9eda3a1ed32a52c379c9173ddb4e72e3fe0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=california+driver%2527+s+license+test+cheat+sheet PDF link annotation
    • http://artistichomesolutions.com/valaxorewalurugobefumeformqsd.pdfIn PDF document text
    • http://trylait.pro/81850498640w5bxc.pdfIn PDF document text
    • http://blankid.ru/the_chronicles_of_narnia_the_voyage_of_the_dawn_treader_official_trailer_hduuohk.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/6740450.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/wofotagexa_womuv_vavufobibumemi_wixurosenof.pdfIn PDF document text
    • http://trenketo.buzz/best_dungeon_crawl_classics_modulesn7q5y.pdfIn PDF document text
    • http://dihtyar.online/what_is_the_most_stupidest_animal_in_the_worldb5zkl.pdfIn PDF document text
    • http://antileqphh.site/how_to_build_a_simple_top_bar_beehivezjipv.pdfIn PDF document text
    • https://daxolefuziru.weebly.com/uploads/1/3/5/9/135963055/galoditofes.pdfIn PDF document text
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/vowore.pdfIn PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/8ae06936.pdfIn PDF document text
    • http://pmaider.com/7638777953513o00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_0fa2592ee22a45c2a3c5c570da3e49a6.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_4e7f6cbc69934740a30c4fe85616f2d9.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_730fe3c88ee2489999d61d08a29e47c7.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_497f5f42ee074b03ac1040461b4d01b6.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_023e9917787e477dbfc92f84f1be5c56.pdf?index=trueIn 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 5108 bytes
SHA-256: dfd76412e99e9f8157b0e4553f163e15f0a99ffe148423c60608fb32c24d478b
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10160 bytes
SHA-256: 01bc965adbf5ea813322078ec8b45e29401f4af8ced3b33dd3981c41b23829a1

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