Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e2decb8cd26398…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 07:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5767b68e5892c1ba51098e87739d488b SHA-1: 8dd2c89148228a4b0c2c548dfde2fe61c7884c31 SHA-256: 26e2decb8cd263988a8c291262f5f6f26c67437c86f086999815d2ecdf1f77a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is `coretry.ru`. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=php+pdo+pdf
    • http://www.bash.cl/media/file/73683783398.pdf
    • https://pioneerlift.com/upfiles/editor/files/22716576180.pdf
    • https://bluetact.com/ckfinder/userfiles/files/gedojovujomonu.pdf
    • http://www.nomorcantikjoss.com/file/darokezetifonup.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/86333604237.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcjq4kmk8337vp92tecvnio8ed/jenijofigipukomasox.pdf
    • http://driver-jazda.pl/upload/file/26815783234.pdf
    • http://musicpark-live.de/userfiles/file/virotofizozowapusubefaj.pdf
    • http://hondasushi.com/uploads/files/76289773171.pdf
    • http://shrlie.com/upload_fck/file/2021-9-22/20210922191102147797.pdf
    • http://swapnakoodu.com/fck_uploads/file/24643866159.pdf
    • https://hometeamcorp.com/images/usr/filagidarexogadij.pdf
    • http://giaexploring.it/userfiles/files/bidiwopuvekinopafu.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/tamufibedopiniginodupibik.pdf
    • https://centralcms.coodex.net/galeria/files/bebogenafex.pdf
    • http://contrast.no/ckfinder/userfiles/files/rukixidasibo.pdf
    • http://www.deco-interieure.com/userfiles/file/baxasarelunotuzozi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfbis182s5lbqlc8db28l0mt53/8702117112.pdf
    • https://greenlandpark.com/uploads/files/vamedew.pdf
    • http://silverk.ru/img/lib/file/10982323064.pdf
    • https://heart-calligraphy.com/uploads/files/202109110904008537.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96584442194.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_off0000ae85.bin
586c522008738a5d80dc726177cdb31fe8736fd7a7f41b22e06948ae7270a525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 9696 bytes
font_01_sfnt_off0000c3a1.bin
caea18c3e04ee22d341c2e46af4e7630b510142f551d5fad7e43b8ee391e1521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 15892 bytes
font_02_sfnt_off0000eba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 16792 bytes

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