Malicious PDF — malware analysis report

Static analysis result for SHA-256 f269daa8f754dd41…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 19:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d41f3ea8e92395ee94888f2682aaa590 SHA-1: 996e1d5a3d38dcf6983a59051692e3fbc2daaa3e SHA-256: f269daa8f754dd416e85c574892b460777f7d9767a0d14bfc879d8a41b76c091
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://hgb.se/filer/file/punofefizujiz.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210906_8FD8593AD0743A55.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/45266912931.pdf
    • http://rosabaum.de/web/editor/files/rumapawotobumu.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/26550798478.pdf
    • http://dmkert.hu/files/file/pupazifelewelelix.pdf
    • https://sambelteri.com/contents/files/lovurira.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/putexozarivagozopumor.pdf
    • https://saigonservices.vn/images/uploads/files/70430431603.pdf
    • http://elskenecologie.nl/files/zowudek.pdf
    • http://directartdeal.com/uploaded_files/userfiles/files/93649310554.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/zewuwoxakegaleko.pdf
    • http://timebymtm.com/upload/files/60908258939.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef164d0663---siginomotemomefaxo.pdf
    • https://chongtham68.com/app/webroot/uploads/files/69425031820.pdf
    • http://finara-v.com/file_media/file_image/file/fazud.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/jafof.pdf
    • https://promtour-rural.ro/userfiles/file/64231880641.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325475b1f8e---gewuverakevetinuk.pdf
    • https://xosobacninh.vn/webroot/img/files/30278316844.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/23147127543.pdf
    • https://s-serviss.lv/userfiles/file/22374076998.pdf
    • http://wish-pharma.com/upload/files/fesanimipelimodolujab.pdf
    • https://dhesient.com/media/xojakodosotisoguwe.pdf
    • http://stlnsk.ru/uploads/file/55553368591.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/58888415552.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=boruto+200+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c170.bin
274ed31f5199345aae748b953bdd5932e38ee071ab75d95be0e1cbe5521ef660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 10164 bytes
font_01_sfnt_off0000d855.bin
c509a1302f8860a7e4073e67d3923417d6bda99766f4f862d0cb786e277af19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 20524 bytes
font_02_sfnt_off00010d3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 16792 bytes

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