Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f4ccf1a1aa7d79…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 07:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: faf06a1b6b77bca5d2045e1331ba99bf SHA-1: a5da8f47b4aa8d47fad30bc3c3a896806fb8a859 SHA-256: e4f4ccf1a1aa7d790b06ea4ae08235a01d2feac6fa5442960991ad497bdb2f95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omegaplus.bg/uploads/pages/files/tudoxanazuton.pdf In PDF document text
    • https://ms2oke.com/contents/files/sojot.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/nasejubeb.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/namolijexovogi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64568451163.pdfIn PDF document text
    • https://penzion-palice.cz/content/34408395999.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fuzifoziwaxirel.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/28400046250.pdfIn PDF document text
    • http://ewtch.com/upload/files/42615555086.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/wetimil.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/95313230932.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/85305980579.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10586954715.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/95031267468.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/zebuxelejojezefa.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/86919029375.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/43395235849.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/88203115589.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/83030125883.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/89955964122.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/901b74ee215a940f560744a826acc607/28186132468.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jexekesiwepuresifubi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zazenilugimizuxavikeru.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/neresunasujiled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=medical+english+vocabulary+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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 11212 bytes
SHA-256: 8eaa101e82d6cb1a1f278f45f9a73c1fc818db4f237404c147f2b6c8c8c26b56
font_01_sfnt_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 15796 bytes
SHA-256: 3b766ac4b6a681157e33204b3454b33898931a592e70e8d4812edf8ecee3176b
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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