Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb3994adfb1a05d…

MALICIOUS

PDF

91.7 KB Created: 2021-04-01 05:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e0ac5e1c2c7e52c416df85c37d03d80 SHA-1: 54b72eb19baa9dcb685313d2f6628596ad4ff60f SHA-256: efb3994adfb1a05dbcee3b16511a5b323cd0e334d4920ec2621a2a5ddca852c3
66 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 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 4

  • 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://vilenefex.ru/wix?keyword=devil+in+the+white+city+part+3+quotes PDF link annotation
    • http://mabirimelu.iblogger.org/vopotatudikefubejim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5fcbd9e325005.pdfIn PDF document text
    • http://fojogil.iblogger.org/dabipokojased.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_60650c582fc6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_604f3886b93cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6010385cec0d0.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/biiljbU/muslim_alarm_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/3nzsiex/kuzixipuribuwager.pdfIn PDF document text
    • https://cdn.sqhk.co/gawarebadal/HLhc8tw/zitivokovupuxipijem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fff23a526509.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/hdsicIj/tedobativimeweg.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/f686860e-bb2b-41e8-802d-bb654c43881f/beats_by_dre_wireless_earbuds_tour_3.pdfIn PDF document text
    • http://burelagufepe.epizy.com/85407603532.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_2abdefe1cc474edf83510bddb6f60199.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_4fe2611b6f8b442d9ccad17a6f1455a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd68493-c0db-406d-84e7-d13058f3ebdf/navy_graduation_dress_code.pdfIn PDF document text
    • http://mokupimi.epizy.com/niwupokofiganewabapivira.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_be77ce46ed1d4af08a2ca216832edf87.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_59e398dc02d34108aaadb875391f92c8.pdf?index=trueIn PDF document text
    • http://fidusigugowubo.epizy.com/software_testing.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_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 5564 bytes
SHA-256: d57d9556f1cbe1edfd994127c285ef901706b93bb0b6bedbe31414a5aad8d494
font_01_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 12588 bytes
SHA-256: 08565ac1b372c92823b6b246b29c2951b00a19133e67ec414428dfd647737b56

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