Malicious PDF — malware analysis report

Static analysis result for SHA-256 93336a265d988c45…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 14:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cd3f1ff08bd331ea6ca66e2648129dce SHA-1: 46ca8142470fd9471a0e3e7e7e5c188f1978b85a SHA-256: 93336a265d988c45c75efe467d1574497347cfbcb1e52130cfe8dd70f710fe4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and a high number of external URIs, many pointing to potentially disposable domains, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious. The embedded JavaScript likely attempts to download or redirect the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.
  • 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 http://ipllaser.in/uploads/xofikoraxaposajozuro.pdf In PDF document text
    • https://mobilieroccasion.fr/uploads/file/52706658117.pdfIn PDF document text
    • http://indexone.ru/upload/file/83649596110.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pn0e86tcfb8go08cg3ss8a46q8/kojib.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/4872422661.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/72015164551.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109100124574812.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jesutuwelinozedomatule.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/72531760050.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/26581752306.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/48334319178.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nupiza.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/23547178348.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/95455457135.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d5ded0a4c---kikuluvexaxekubo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lipuvivusomewu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908014830.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/82582824629.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/27295090850.pdfIn PDF document text
    • https://wonkingchina.com/d/files/81062973634.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/vosajogimeronubu.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/48831501417.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gudimizudefemofos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+project+ideas+2020PDF 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 17640 bytes
SHA-256: 5dbacbbb7c90813d2a6e0252e4e9d845fe859f95d09af186aafe341b1d0fccb5
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10812 bytes
SHA-256: f654a5c1bf3e0476148ed5a167b9b9b1f318902a16c71214941acc02d6e483a3
font_02_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1