Malicious PDF — malware analysis report

Static analysis result for SHA-256 b601935fdf124546…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 20:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a6f96d181ff7ae0163249f654cec5e SHA-1: 715bc7c14d0c6f71f231741a650dce55fd8ac926 SHA-256: b601935fdf124546434c9894d3cc8eb701175bc6ce327be3ec595a9bf19a9a59
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=read+comics+android
    • https://esprimagroup.com/userfiles/file/96300055651.pdf
    • http://mobilenmr.com/files/files/11664359140.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614216ee95afc---jazixagefu.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/35064824383.pdf
    • http://33podarka.ru/pictures/files/puxoxo.pdf
    • http://copingconversations.com/userfiles/file/14635673265.pdf
    • http://francescasciortino.it/userfiles/files/47033297296.pdf
    • http://zkojicin.cz/userfiles/file/favabubegufinoje.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/96149384777.pdf
    • http://esipro.fr/userfiles/file/donalawuwewuxuxuxafos.pdf
    • http://manhtreminhduc.com/webroot/img/files/55891168058.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/jujebemubajamadano.pdf
    • http://promocode.lu/userfiles/files/20799541291.pdf
    • http://bancasemecanino.com/userfiles/files/97397132856.pdf
    • https://vientangluc.com/upload/files/71500276703.pdf
    • http://kaies.cn/upfiles/file/98231247602.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/mitezujekovewoze.pdf
    • https://billard-hauri.ch/userfiles/file/gupugebejalimibaxoz.pdf
    • https://aletihad-group.com/userfiles/files/xegupatigimokox.pdf
    • http://jessie.vn/images/ckeditor/files/34024950229.pdf
    • http://dental-forum.ru/userfiles/file/napuxetowep.pdf
    • https://dpengineerindia.com/admin/userfiles/file/gudiwolif.pdf
    • http://mt-filtration.com/uploaded/file/1307524148613c90a88d6eb.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_off0000f463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
font_01_sfnt_off00010c75.bin
b06023adea5684aa7ebd3276ea51363ce65f7047c351caf4c302ecf02e93528b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 17332 bytes
font_02_sfnt_off00013989.bin
df4d774acea0b12640c316d38a62ab17bb7eab5de1cbb1cc28b5566bc4a6d9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 10432 bytes

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