Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4b75f27b95b12b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-23 01:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746ab26f4554fdc7ade8b4d96ffb0e81 SHA-1: c01f24c196fc4d6bc19873fbd31f05d6d0eea72b SHA-256: 2d4b75f27b95b12b560abdebd091582e346ebefe325b468b0f6c55b857b29c40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://archism.ru/uplcv?utm_term=minecraft+1+17+0+54
    • http://vilniausgreziniai.lt/userfiles/file/40092488803.pdf
    • http://kubkao-kubpla.com/userfiles/files/lafezedemukovokemategu.pdf
    • http://as-eng.biz/userfiles/file/zadosiximag.pdf
    • http://vektor-bezpeki.com/userfiles/files/lixepu.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/duvepadetitoli.pdf
    • http://hanasushimenifee.com/uploads/files/2238176396.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pobutalafisijuzusagub.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/vedaw.pdf
    • http://masonhn.com/d/files/mabedatalukiketusebubev.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e2ce5c5b6---netotupatijagu.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/93191177156.pdf
    • http://lauraestetica.com/userfiles/files/75673920946.pdf
    • http://sapthagireesyathra.com/userfiles/file/13003813697.pdf
    • http://thingsantiquesla.com/userfiles/files/patuwinezen.pdf
    • https://atputasbazes.lv/images/userfiles/files/zijewegipovepav.pdf
    • https://doitoutdoorz.com/file/Fwo4zXnJVTU19yT1.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/84547811275.pdf
    • https://livermore.com/wysiwygfiles/file/dujejagotomagaxabage.pdf
    • http://www.moyekolodin.com/files/66356995239.pdf
    • http://dallapietamarchisio.it/userfiles/files/48463013364.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/fawimodopusebare.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141baf81a181---xunewila.pdf
    • http://ortosprendimai.lt/userfiles/file/zekitu.pdf
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zavifewedojoroxakafu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 16792 bytes
font_01_sfnt_off0000d959.bin
228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 1888 bytes
font_02_sfnt_off0000e21d.bin
177696364253db13fc8cf012f58d10c21687453fa9c40ea71fc4bf5fa7d3373c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 17092 bytes
font_03_sfnt_off0000fb73.bin
e1f57829bc567f7fe2d19e86b6e64d3340979ebc939985a848de3d1b1fdf4390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10424 bytes
font_04_sfnt_off00011363.bin
b5ed443c699f5fab4b3871bcd54e0fad7574455de96624f79b40d42eab980d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 21460 bytes

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