Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7cb848edf7625f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 10:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c53a78d37505f13497cf41590fccda35 SHA-1: 699c483adb986f899c186ca075fd60de088e69c8 SHA-256: 8c7cb848edf7625f5518b0f8308b410efb54d88eb62659974f11ff11f9196fc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms designed to obscure the ultimate destination. One prominent URL, 'https://wastran.ru/uplcv?utm_term=install+apps+from+unknown+sources', suggests a lure related to app installation, a common phishing tactic. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=install+apps+from+unknown+sources
    • http://cataga.de/beta/files/file/1972309696.pdf
    • https://beehaviour.nl/userfiles/file/mazetuvawus.pdf
    • http://folientastaturen.pl/_data/file/70653639143.pdf
    • http://qdjshg.com/files/file/kovetusemidi.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/36264853747.pdf
    • http://eco-building.cz/UserFiles/File/tewokegotivasepopoxulaw.pdf
    • http://faw-asia.com/image/upload/files/lebulobako.pdf
    • http://ekopaczka.pl/imgbrama/files/11990391361.pdf
    • http://tnmetalworks.com/images/files/tagiwirenomudijexirinesex.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/10155494292.pdf
    • http://vimar.ua/userfiles/files/22950164142.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210902_EB9F457BA81FC182.pdf
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/bosapopexopab.pdf
    • https://asiquim.com/ckfinder/userfiles/files/49926875464.pdf
    • http://studiodabo.eu/userfiles/files/87492180634.pdf
    • http://nhuahoanglong.com/luutru/files/44895825858.pdf
    • http://dkmmotor.com/files/userfiles/file/4253091780.pdf
    • https://associazionemusicaviva.it/uploads/file/43460844333.pdf
    • https://ytdrive.com/CKEdit/upload/files/36087123234.pdf
    • http://gmtshipping.com/attachment/file/panodoje.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/80002117129.pdf
    • https://lazerom.pro/media/file/88047832638.pdf
    • http://teleinwestor.com/userfiles/file/vigizatuxamajewi.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_off0000b293.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
font_01_sfnt_off0000caaa.bin
4ff03d9bb8ef5f2cbe553a5fe6b4f757da347a22e287b3c992f7f921efe40bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 10780 bytes
font_02_sfnt_off0000e39a.bin
cde5aef7411d68259047c2f0fe23f565144ab18ba76c3df0c08ea3cc2a892b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 17748 bytes

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