Malicious PDF — malware analysis report

Static analysis result for SHA-256 b337a0c4a75ca77a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 21:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22d370bd0d832d042ddc2cc5afb83e7d SHA-1: f0d0ec71beb1f9a7f0af824f64a2d6dd0c3de5c8 SHA-256: b337a0c4a75ca77af54351c2f6fe873263bfe7bc23425051b6a86703b3fdaea3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites or engage them in a phishing scheme. The presence of numerous distinct hosts and links points towards a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://drivescuolaguida.it/userfiles/files/viroxegevufawileb.pdf In PDF document text
    • http://www.petersonassoc.com/emailimages/file/mogiv.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/guzirizin.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/kopila.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/povaxosuxizigik.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57424115095.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/o75l5q5oqd84ek4u41tkijgvu8/fazanonasexepapafunujuz.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/93255871186.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/57594557791.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/81995026562.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/74295452917.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sovitawuzoboluwejuguxer.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/50608252920.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/fibinatepazu.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/babipepavuzamuguzukin.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabesanatok.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/fesiziziworivosewitixami.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/vefarol.pdfIn PDF document text
    • http://protezas.lt/i/File/rutiburile.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/79d52cb8923ea2e9a570f31320ab81e5/73276891124.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zupuremagakinomogomagig.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/gozunifebomagipokasogov.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/54191165912.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rogagur.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/lejapamifujubenawupo.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///63154303897.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/gateworobokuxuzof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+video+editor+android+no+watermarkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 10660 bytes
SHA-256: 54a408ffab6e543a4b867db1a3d8a8e2f991e1a7b73226217e4f86d81183a25a
font_01_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17116 bytes
SHA-256: ea1cc4c855dd94e56aea6ad445eb71cbbad8d8b8a5c657f4891b3481fbd45f89

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