Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1d99f55fdcd655…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 02:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a35a1989894a1b661fa1e5ce2beea4c9 SHA-1: 8f3ab36efe11e2e2f7a6c26940d06008920195d4 SHA-256: df1d99f55fdcd6554cf894afd0772bd8bd26d4f1674711aee0b1753399e45487
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=riff+tamson+action+figure PDF link annotation
    • https://cdn.sqhk.co/kibutonap/ifidtjb/63533225325.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/bLKOtii/13564413509.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/aKHkbwF/nomerapefug.pdfIn PDF document text
    • http://businessoutsourcing.info/7478686494qh9pq.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jh4i5jg/names_of_characters_in_who_moved_my_cheese.pdfIn PDF document text
    • http://ukranews.site/sundarakanda_parayanam_vidhi_teluguwy9jt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_6026876b5fd2e.pdfIn PDF document text
    • http://supportcopyright.net/illinois_real_estate_broker_license_application_formv92sz.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/FFDvhbb/best_photo_editing_software_for_beginners_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/bARhjhH/49806736495.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fLZAKUn/kaxukorujobuvaferexonug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fccf78b0025d.pdfIn PDF document text
    • http://ipatovaalena.ru/kovaak_s_aim_trainer_free_no52swz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_6048457785fcf.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/5d897e09-5977-41db-823b-b0c09af2fe74/69467812794.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_f2c0e60ba1634ef5bf76d07777951ddd.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_f15f052414cc4550804456c4819573be.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_adcd5bb67e3d4a2094969821b27a7a97.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_15f8c81947ec482d8c41d08397a3bde7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2bfffe-3572-47c9-b867-e5bc08449b33/23138418693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b659ce-c392-4bfb-89b3-1a16a9a029f4/25146123064.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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5176 bytes
SHA-256: 23f6bbf5836481940b0d7e0ae97d7a176f7c819829a410cb21a4c64346e62107
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 10508 bytes
SHA-256: 2067d29f66a8096b26778c1649f5610535313f2024fc38a7ba25ddf77181ad9e

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