Malicious PDF — malware analysis report

Static analysis result for SHA-256 999831562f156799…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 09:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a9f099a1c4617fb54d9de5c69fb8476 SHA-1: 0bfdbd0778d1557c79311a5bd4c30ad2604cb555 SHA-256: 999831562f1567997d3d3da80caf07c0797e4dc6ae772845b75a37c643b4380e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite one being confirmed benign, point towards a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://refakatci.net/userfiles/file/debejafonawiwom.pdf In PDF document text
    • http://stavo-bazar.cz/userfiles/file/figaxesezu.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/72129102332.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/vozemurivegajibijigukoto.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/37915840489.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911061108.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tefosejusoxitifemu.pdfIn PDF document text
    • http://htcable.cn/d/files/fexixebodevi.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/36484505353.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/94301468029.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/mopexuwovijilusa.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/5156012162.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/36807985390.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/62329590220.pdfIn PDF document text
    • https://redac.ch/upload/50238379017.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d59631c38---81189398017.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/3655176091.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/42797503530.pdfIn PDF document text
    • https://sinarwaja.com/account/files/57126297387.pdfIn PDF document text
    • http://learningkey.org/userfiles/34301791485.pdfIn PDF document text
    • http://autovoda.ru/upload/files/35670547655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=short+story+about+sea+animals+pdfPDF 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 11192 bytes
SHA-256: 58ef8ff41f13eb0ea785b7cd49b24a31a6c033c12d18fd3b591db514652f9817
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 17960 bytes
SHA-256: 86ca703c20365460dc4542ffc8de6249a7318dd5320ccbb819b26d2d54c67ddd
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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