Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3d664a625512e3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 10:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43f32e8695f7bde28cc1abdd8db4f759 SHA-1: edfda7b8f40407376d963408601b2132bd7c79eb SHA-256: da3d664a625512e3a18bc5aa5e439803bbd77f4165a2d392734f7a1b8c74f105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. While no scripts were directly extracted, the PDF structure and embedded links are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mojefas.pdf In PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55568244797.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/kixipemojufuwodokapazev.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/68144230159.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e28dba174---kufubiv.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ruluk.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mesunoxijurifebabivudej.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/punibolituv.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/pamuvojoxixiwekedusopi.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/90868695464.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/30213725885.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06a313544e92017f3d99c16ce8c68d1a/rifefidifotejukiximeb.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/3844466704.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210914190754.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/40386815420.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebokug.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tepofusawuxigimuvuf.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/23897139126.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/morogo.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/43962486672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=super+metroid+android+wallpaperPDF 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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 17068 bytes
SHA-256: a205bfba2cc45d751ca798316bda1c7fa3536c81b83e490d70c5d0a9e8bcaee0
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10648 bytes
SHA-256: 381d32fc4ec4bccf70841db6c1fe7330569393aa381dd8f15f9dd7ee541f3fb1

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