Malicious PDF — malware analysis report

Static analysis result for SHA-256 150fd3f0ed6a323b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-03 04:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c42f496cd6b1f266a354a5e4324a631 SHA-1: 9179b1903c61e61f3abcd26e8d5d4879238aee09 SHA-256: 150fd3f0ed6a323b06607f8a72bf499c2e755f275e93079c4bebc025b38f40de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://fokemale.ru/123?utm_term=letter+of+intent+for+business+purchase+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474462/normal_606bfe10852aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fe112db67f9f.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/6881389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_6037ed50d08d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fd9f220caaac.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/sapumali-muxujivuw-zadudame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_601ef46169e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6020750d9b207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_601bdfb412201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_60069f491b457.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5ff85e5756972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144446820/dipafetugufisex.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144534360/comment_tlcharger_bordereau_de_paiement_cnss_maroc.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144536607/61429675032.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/sunilituro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8102090c-c17e-482e-9d66-b141d5abbc58/why_is_my_cuisinart_keurig_coffee_maker_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a77b0d0-3a70-4357-8203-95c278b59a55/how_to_adjust_howard_leight_impact_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e6c825-94ce-4560-acf9-f2f44c9005bd/how_to_make_outro_in_intro_maker.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_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 5336 bytes
SHA-256: 063d72f8fe1841559a9dc139f3ac8d0b8d49871c1906baff1dd250211762785d
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 11288 bytes
SHA-256: f63ee55fc1dba091cb93e8c04ea9c444f5d06b85f8a97004606f1e37a94b8cff

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