Malicious PDF — malware analysis report

Static analysis result for SHA-256 b390b7e29cc22569…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc4c8272f84642f79d1ef6c0e793727c SHA-1: f285fb463e1e59fafc37f622fe7a82def2cdeaef SHA-256: b390b7e29cc2256928f6e95c44345db3d61dfbb05b0d2662cfadbc23a470b773
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 and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=bible+verse+hd+wallpaper+for+android PDF link annotation
    • https://etevent.itweald.com/uploads/files/612fe79eb21e6.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/tikowelubomupuzikimas.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/sojomeviwiwomupuwinumawim.pdfIn PDF document text
    • http://liily.jp/upload/file/20210902081432.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/36465979394.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/xitadefuwivaruzujibon.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210903_180947.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/91489108480.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/66456640329.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/dawuxaxiwazojuvubibufego.pdfIn PDF document text
    • http://xsteelstock.com/d/files/75156819841.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/30121324795.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/moxitat.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/90501151192.pdfIn PDF document text
    • http://come2menorca.com/images/file/23824191701.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kob0kr5jjhh4j91t8eiuocis96/57421743807.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xijerisololiroluf.pdfIn PDF document text
    • http://fxlcd.com/upload/file/45060173491.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/rapasowubalaka.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904144843.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/radamuvekelijijijaxotaba.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139233171ae5---25434745274.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_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 10844 bytes
SHA-256: f4398b5484fd3d414c435ed9f53ccfbda4b0a9e7189c17b8fc1eb3d1bff480eb
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17724 bytes
SHA-256: 4ecafe5b1280545f0ab96412135498cbbd51fa07629499bcc517e80918cd46c0

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