Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe71eb3dbf4a469…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 20:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10eb211da43cd3f488458929c2e02826 SHA-1: d60353b58dbbc542c602a63a0273298f4db08fb9 SHA-256: dbe71eb3dbf4a4697e66886872092fc2fa585d48cab80fbbe1e01207c1e2f932
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts confirm this behavior. ClamAV and the ML classifier also flagged this PDF as malicious, indicating it likely serves as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://awfiowv.love-mrt.com/upload/files/kigokazej.pdf
    • https://highrise.pl/file/dumebewa.pdf
    • https://tecnibat.net/uploads/archivos/zoker.pdf
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sozav.pdf
    • https://holycrosshealthcare.com/userfiles/files/fivexiwizedikepogi.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/62663340386.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/38030946216.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/grrinb2psl7b1mae6rl2kdnbj0/kotizevovedumepesus.pdf
    • http://jadeite.ru/images/file/mojizibanogikop.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/fafaza.pdf
    • https://suprastoc.ro/userfiles/file/27507186976.pdf
    • https://npkfertilizerproduction.com/d/files/31754989447.pdf
    • https://thefencedocumentary.com/adminfiles/file/28996685389.pdf
    • https://sukienmiennam.com/userupload/files/63277003341.pdf
    • http://galerie45.com/userfiles/file/pepaj.pdf
    • http://ingegneriarossi.it/userfiles/files/6248659325.pdf
    • http://garderoba.sk/images/_file/zuwijumasubot.pdf
    • http://mtt-association.fr/upload/file/5146347964.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1r340l35dbvjsccugqobhr8mu1/52355150547.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/1387809191.pdf
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/26582818086.pdf
    • https://network-italia.it/file/kukuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=soul+movie+torrent
    • 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_off0000bfd0.bin
dbe1654b81dd68213e997d8e0e9a948f32fcde9117f7c02307fc67dcdb311811
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 17192 bytes
font_01_sfnt_off0000ecfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 16792 bytes
font_02_sfnt_off00010511.bin
f4730f42cad0480dbe4ee422dd6c3fd116ae65c6dd18bbe5a2c5d1848b4b5fd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10180 bytes