Malicious PDF — malware analysis report

Static analysis result for SHA-256 c862532a4beffd57…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 02:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d3c275084566d0da8510dad93aa5990e SHA-1: 2d4098dcb7c6fee3770f691fff6e9c4d5b002461 SHA-256: c862532a4beffd577a2e4851e2d3ae9effef139b6bab17f22165c542fbc7b36c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://coretry.ru/uplcv?utm_term=android+tower+defense+without+in+app+purchase PDF link annotation
    • http://fzsvybbs.at/userfiles/file/soporedesoganovumizij.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/71955174363.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/7362340929.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/88473767883.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/xixukufuxojefojepatovopu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/21595659902.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/59932733320.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/44974844759.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xuzigidovixa.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/39904249574.pdfIn PDF document text
    • http://didula.com/img/file/95352167906.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/8152530627.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/kekejorazozijezujuw.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a497f215a---56918179670.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/83307480007.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a1aa3180---tizukowibipaxegoxa.pdfIn PDF document text
    • http://chinalabware.net/d/files/53554750435.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/masotura.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rorigezitopepu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pepasitovujamiwax.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191918505796.pdfIn PDF document text
    • 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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17416 bytes
SHA-256: ec1547390e4426080286f7cc6b372ae4055a8e3dd7eeab12351ecc7353978dff
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 10840 bytes
SHA-256: 09df372f729638c8b33ce41591f057c090448b1deddb95106281bae61abe807b

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