Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce53727753882ee…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 18:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13a3641054d2f25d59119f7afef1cb3d SHA-1: 9783739bb63d0192b33545d83adc58d8cb71e961 SHA-256: 9ce53727753882eeba76b2eb58109156ee1a20fb99e585df8b032863bda9cc77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware through the linked content. The sample's structure and numerous links point towards a link farm designed to obscure the ultimate destination.

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
  • 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://coretry.ru/uplcv?utm_term=ms+pac+man+android
    • https://webvitamin.vn/app/webroot/uploads/files/dejemisixoji.pdf
    • https://pamukoglu.com/userfiles/file/32324223676.pdf
    • http://clubmaniacr.com/campannas/file/fibododazes.pdf
    • http://gazosilikatnn.ru/uploads/files/67181718785.pdf
    • http://jr-bang.com/uploadfiles/20210903231201.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/nonegenivuxogajabujepevan.pdf
    • https://luckyfood.itweald.com/uploads/files/6134426b7eb94.pdf
    • http://www.childofafrica.org/media/userfiles/file/jakupavosefugotavuzozabog.pdf
    • https://holocaustresearch.pl/nowy/photo/file/zewevitoderodezoparadivud.pdf
    • http://feach.ie/images/uploads/file/91639550162.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/34726142329.pdf
    • http://idealthailand.com/file_media/file_image/file/baluzikul.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/16022443533.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/bowiwixas.pdf
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/purerububanududovomunugam.pdf
    • http://medicapoland.pl/uploaded/file/newuzarimabimezotiwowol.pdf
    • https://mahae.hu/files/files/gijazadu.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/73432899726.pdf
    • http://home-plast.ru/foto/files/58466150049.pdf
    • http://kruengrangthai.com/files/files/18364917949.pdf
    • http://zkqzl.com/uploadfile/file///2021090105575842.pdf
    • http://dent-pro.cz/pic/file/42334050086.pdf
    • http://kieryk.pl/img/userfiles/file/11036475442.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/93904796738.pdf
    • http://odontotecnicacoop.it/userfiles/file/33617811708.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_off0000c7da.bin
03c5a22fcfc6eb18aa67fb1b987d0ed576599cf80d9c3a12046922e5f8bf854d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 10392 bytes
font_01_sfnt_off0000df4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 16792 bytes
font_02_sfnt_off0000f75e.bin
ad4b7e9086e8fe7a519036b516f8b2c83a986d1be9bcf8aaf83e68097318265f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 17720 bytes