Malicious PDF — malware analysis report

Static analysis result for SHA-256 532fdb5a4ce26415…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 20:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8af25dfadf08f0b8b6e9b8cf903fe31 SHA-1: 6bd3b66cf53fa5aa08922fe6d6436402a841ab48 SHA-256: 532fdb5a4ce264154a4ce4794331d75eec28fe894a3a559fb94c8ac26b96f194
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=apnea+obstructiva+del+sue%C3%B1o+pdf+pediatria
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/1944985920.pdf
    • http://garderoba.sk/images/_file/diporizenif.pdf
    • http://ntvietnga.com/upload/files/nozopugofexisejotepazera.pdf
    • http://acudrved.com/ckfinder/userfiles/files/xodirenorexizijipete.pdf
    • https://ismart99.net/upload/files/tarorudolon.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135729a7bf06---sajumebiduk.pdf
    • http://aire-limpio.com/img/editor/file/4426494354.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/fevetewogesolapenuk.pdf
    • http://ansing.nl/userfiles/file/vijejisikatonikewobofupi.pdf
    • http://architectureanddesign.it/userfiles/files/77189694192.pdf
    • http://dlastudenta.org/Upload/file/93495479657.pdf
    • http://pkpneu.cz/userfiles/file/jusameburefufiwuraga.pdf
    • http://szm.hu/userfiles/file/talolup.pdf
    • http://sztarmedia.hu/_user/file/48820707811.pdf
    • https://medsplus.us/admin/images/file/99310925406.pdf
    • http://pscemetery.com/userfiles/file/78549445285.pdf
    • http://petra-dario.info/upload/datoteke/39899922807.pdf
    • https://adium.ru/userfiles/file/28081728052.pdf
    • https://selispin.com/calisma2/files/uploads/dasurukam.pdf
    • https://nycsmindia.org/ckfinder/userfiles/files/92607757743.pdf
    • http://belly.bpv.su/content/files/files/sisomifuzoluseni.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/nuderiwiseburibemagesut.pdf
    • http://snieznik.pl/userfiles/file/bagavanobosazawebegazoso.pdf
    • http://moiarchitekci.pl/pliki/file/37575580623.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_off0000bc46.bin
c9d33f9fc8d1da1f0906f2bb22c706afe080527032c493350bca826f07604449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 11108 bytes
font_01_sfnt_off0000d5ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 16792 bytes
font_02_sfnt_off0000edfe.bin
5b2f2bd6bec490025b8271c7bdd5d1d4bc59a1d116c349ecf725695333fd9155		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16844 bytes

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