Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db3b9551627edce…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed172b7b1f6cc85ced9c296496a1869 SHA-1: c09f2b6273cee4fbcd9e962cba42d3e2e412d0e8 SHA-256: 3db3b9551627edcef162470c91d1b387042ec2a652d4ced96e302a953ab714a6
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, several of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this, suggesting a lure to initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=suicide+squad+streaming+english
    • http://cesnek-vysocina.cz/UserFiles/File/nofewiguso.pdf
    • https://martensmgt.com/business_school/uploads/file/mozavupel.pdf
    • https://xn--90ah6akb9e.xn--p1ai/f/file/mevigetazibanagisaxipu.pdf
    • http://garagehayashi.com/js/upload/files/71170634979.pdf
    • https://art-lamps-rali.eu/files/file/sizazuwasaturavukive.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/ribekakela.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/pasixis.pdf
    • https://damiel.eu/userfiles/file/raxozinilojumaxefos.pdf
    • https://mobspace.xyz/web/img/podborky/files/norilonapejimalinewesaxav.pdf
    • https://footballsod.com/images/ck-uploads/files/29050748841.pdf
    • http://leebyunghun.org/new/upload/board/files/lafijoran.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/78870813696.pdf
    • https://dom4m.by/userfiles/files/40766462643.pdf
    • http://wenxuezj.com/images/File/81977307599.pdf
    • http://damvua.com/damvua/public/images/files/wojivosape.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/54548929798.pdf
    • http://onlinecommerce.bg/uploads/pages/files/daresulakesenepux.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/rupewoxotigoz.pdf
    • http://madonnina.info/userfiles/files/gipiwenipoxas.pdf
    • http://euskararenginkana.eus/files/galeria/files/68850778055.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-04-17-10-17-77.pdf
    • http://denge.aero/upload/files/lopokeninil.pdf
    • http://makassitools.com/userfiles/file///fopibe.pdf
    • https://elesud.it/img_pagine/file/mugigorudutexesevi.pdf
    • 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_off0000f4eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
font_01_sfnt_off00010cfd.bin
529c8271e08d22a00a4b3e7abb2181bbe93dd3547647b66649866f65ab90dc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 20180 bytes
font_02_sfnt_off00014170.bin
4c269a5c3f4682a5f2b4b239b18daee3fe03ce70a96a05849e238e2cf683273c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14170 11020 bytes

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