Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d98250cdc8f0c3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 20:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2cd4844bc55e743a574558beeb96fc2f SHA-1: e9a65dce1faaab16c77a8e256a6c456d7d5ff94b SHA-256: 56d98250cdc8f0c3d02a4e8655d4bd8a294d7769731eb264e98642864734c687
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://midufefew.ru/strik?utm_term=the+5th+wave+books+review PDF link annotation
    • https://cdn.sqhk.co/vabalogu/gJDojij/newbury_comics_store_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_604510daa2369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_6018cb7a28d51.pdfIn PDF document text
    • http://copyrighthelp.info/nipafodemamanovpqbbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_605bccfd73b2e.pdfIn PDF document text
    • http://magic-spring.com/yfl_222_reviewfsthd.pdfIn PDF document text
    • http://zavodtriumf.com/bupodozinisukegatekuwajuwe63ik.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/biforafapimedu.pdfIn PDF document text
    • http://jowopejev.22web.org/bicken_back_being_bool.pdfIn PDF document text
    • http://fejoromawefobo.22web.org/52478410830.pdfIn PDF document text
    • http://cheeronthemove.store/74545370629zuukl.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/247903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5ff92ba175cbb.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/G4Yhijg/11669593294.pdfIn PDF document text
    • http://tb-films.ru/best_warcraft_3_frozen_throne_tower_defense_mapsgegsv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_e852e990930041d0969be88e5dc25072.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_b96c76de6a7d43f3bb5e63393590269a.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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5168 bytes
SHA-256: e575593bbee71174ed52e1ad2fb42c45eb899834dc32413d16dec115cf9a6389
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 11056 bytes
SHA-256: e201fb03abcee11c2e79c168eb4b881db2a54ed23df54692158db57da07af1ed

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