Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a09e3b188763ba…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 12:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd9582a7373486124da35b178416ceb SHA-1: 7b7d11a32882473b29eb84aec84daac0c21f0b77 SHA-256: b5a09e3b188763ba650db92d89c262a23d888ea2ffb8b39ed543b45929705b85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that act as a link farm, redirecting to various external sites. The PDF structure and the presence of external URIs suggest an attempt to lure users to malicious content or phishing pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=angela+mod+apk
    • https://rimi.sk/userfiles/file/weved.pdf
    • http://horizonpestservices.com/userfile/kutezadatuvidatewimokipa.pdf
    • https://posetili.ru/userfiles/file/46709725050.pdf
    • http://qamsar.org/userfiles/files/jerabodevarokifuzu.pdf
    • http://mawratanews.com/armedia/uploads/files/lutibaxetuwopojegaxikawo.pdf
    • http://www.kickcommerce.com/userfiles/file/xiwamidemi.pdf
    • http://salonorganica.ru/upload/files/juranejemuvolarolibopal.pdf
    • http://aminotp.com/upload/files/82563637539.pdf
    • http://highgaincomposites.com/img/file/2021981450.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/vunetuvutorigoju.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131a137dd3d4---84506651855.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614920160cfba---81623436619.pdf
    • http://petukmahaaaraj.com/userfiles/file/wedirowutajoj.pdf
    • https://abss.pt/userfiles/file/50014422503.pdf
    • http://carszana.com/image/upload/File/xawageluzutenufat.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufuputemaxebana.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/20539464744.pdf
    • http://simoncaulkin.com/images/57592996504.pdf
    • https://soswzgierz.pl/web/uploads/files/fitedusudimitojola.pdf
    • http://club-integra.ru/userfiles/file/pidowobukigebodomuzizo.pdf
    • http://one9five.com/userfiles/files/8996941741.pdf
    • https://cargotavio.ru/files/file/povoxizaxopawuregenoleb.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/rageribubabefafesixu.pdf
    • http://woodbridgeabw.com/uploads/files/gagobimulufufotonigudupi.pdf
    • http://kodemari.info/data/files/91998683728.pdf
    • http://ipceurope.be/assets/file/20960302247.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_off0000b72e.bin
9e8682bebe3d161f5152e1efc8efd1b26c6a5f50f34abf0de08c1b3e006f294f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 14944 bytes
font_01_sfnt_off0000dcb6.bin
63b702ac77d8fd29432f4c44bf23629c62d78513ea85491e504f5a61ce92536e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 10348 bytes
font_02_sfnt_off0000f3d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.