Malicious PDF — malware analysis report

Static analysis result for SHA-256 636b9404848b342e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 00:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 921f50ab4f79bed8786c108c39914486 SHA-1: f60529b13354e05a127d5b28b1f13d1dfb0ac050 SHA-256: 636b9404848b342e678eeb8f97dbb7c55c4ea285e9bc2f81a081c7d510c46279
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of these external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=kwh+pc+calculator PDF link annotation
    • http://jeanthompson.nl/ckfinder/userfiles/files/rejewesifapi.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/64450470865.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/xuladaki.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/99463492625.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/nirub.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/39486393739.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901014642.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/55308212133.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/83734682489.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/tatedafabunewawawileluxa.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/33300152496.pdfIn PDF document text
    • http://sushibelovo.ru/files/60650046232.pdfIn PDF document text
    • http://pnalog.ru/images/file/vabuvipuvositowepela.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/vavikor.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/giremumuvoj.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/belanedo.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/tutozikozawuku.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210910100655_829811078.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/475252555.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/11626166890.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b8f69649---furov.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ffc7d7234ea8f3063ba9df5449c2e76d/rovanize.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/sobamaxataketasikuloko.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bajoguwoguto.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://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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 10152 bytes
SHA-256: 953bd11ce8472346a6075d9fc0dd877a53b6f104dc5f3f8cfc19fe1fa49d1e15
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 18504 bytes
SHA-256: 17c97792ffea3cb2c3ee84b2d9ccf766fd9f7325ae3db264b362db2e8a3bf4ee

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