Malicious PDF — malware analysis report

Static analysis result for SHA-256 a476786206f1bbff…

MALICIOUS

PDF

65.8 KB Created: 2021-02-24 13:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e7d2c574f0752d5ff44b1161d9c0431f SHA-1: 65fe918064daa340176dfd0ba74d6a4deb3f1f86 SHA-256: a476786206f1bbffc74501bab2523b8e124e023b1bf85df33051bb58a9eb3f37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on potentially malicious hosting. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=equity+digital+alarm+clock+manual PDF link annotation
    • http://doweryklkq.space/gefifajenabaaxufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_60192138211fe.pdfIn PDF document text
    • http://minuette.me/pioneer_appradio_3_sph-_da2105nptj.pdfIn PDF document text
    • http://xobaxibudizoba.22web.org/31815954515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601a7d79d6bc4.pdfIn PDF document text
    • http://1fps.ru/47815296118qf8ws.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/convert_kindle_azw_to.pdfIn PDF document text
    • http://websporizlehd.com/buzebenudiwi2t73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5ffa077b42daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_600c08c1c892d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_60011e93b55f0.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/ejgMihq/pudezovekowig.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/27875666763ekp72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fd38ae89b0f5.pdfIn PDF document text
    • http://about-central.com/margin_of_safety_ratio_accountingg1za0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_602c2d97dd58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_60246d2e155e3.pdfIn PDF document text
    • http://busibear.com/69827937656rebth.pdfIn PDF document text
    • http://palitra-cveta.ru/five_below_ryan_toys8773x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwilud.epizy.com/annotation_edit_manual.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/77242596824.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_off0000c30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30B 5332 bytes
SHA-256: 06e17e037fa24de640954d75fb0991dc9000141160858a608fc2c2109edaf765
font_01_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 10696 bytes
SHA-256: f1e050c7ce98d06740dceb3df2ed0103c1bc2fec60c40acef53e80333b86cce3

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