Malicious PDF — malware analysis report

Static analysis result for SHA-256 958dc254ed42881e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 06:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3d83eabd8e6e1fd726aedb0d5e8b987 SHA-1: 3ebd2df73a4881df9fbd9aa383374a87006f5d84 SHA-256: 958dc254ed42881ecab09db6c86fb3fd07279545703c9824ed49ed77ffbbe39a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://orosweb.hu/ckfinder/userfiles/files/notokadazo.pdf In PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/xikiwijubeb.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/82621613129.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/pevaseduxed.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/jukujakarino.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410db721628---pepujifikof.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/tezezaxafebavudobikif.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rokimurid.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zufonex.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wafadotu.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/zelazo.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/demexuloforedawuxawobasi.pdfIn PDF document text
    • http://tianjin.relieved007.cn/upload/files/50602038766.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/47717951524.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/36547373168.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/wokarozarikilifaref.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/tiluzedurizakuzazajewane.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/deb0b2ef9d33dfbdda76bf406240f7f6/3131950610.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/valud.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/vodajakolisuvobinadiba.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/67738658152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dsl+hilfe+app+androidPDF 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_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 17312 bytes
SHA-256: 9e0b02b1d79f6f1c8c86575a88bc968864f39c7c2f1bf0ecc1b85b7a52a8a0fa
font_02_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10496 bytes
SHA-256: e8661668f464671298372d6de7514986dd7fe53c15f98b2c3c861ba4e295669e

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