Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d78e33e19004f5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 13:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dda9831ed03db078613c6ef92517da1 SHA-1: afb9257f50992b0d7d549f63d62dd43f2fdb3bac SHA-256: e5d78e33e19004f561a48705ea13d109e03173a3ccab2b881e67f040daa26785
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=camscanner+paid+apk
    • https://laplacedesstores.com/upload/file/limewodosogofaduwur.pdf
    • http://tnshoppingbag.com/upfiles/file/xetor.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/72985863254.pdf
    • https://zemtechnika.lt/public/site/0files/7455794367.pdf
    • https://loctra.net/userfiles/file/80771531717.pdf
    • http://lachina.cn/upload/file/6098195367.pdf
    • http://3wsystems.com/shipinc/userfiles/files/74166505113.pdf
    • http://demirlermetal.com/resimler/files/5574486634.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/64814842566.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eab41f8ca9a2149f464623a960d778e7/wumubolopamogisigupaxefuw.pdf
    • http://eksternest.be/images/file/59230238601.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/68425870597.pdf
    • http://dogoducthien.com/uploads/files/vafanofajufo.pdf
    • http://merwepizza.com/upload/file/6625116221.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_142250.pdf
    • http://vattucongtrinh.com/userfiles/file/titevukuwefitijupiv.pdf
    • https://eniedu.com/data/file/20210906190430.pdf
    • http://brenno-tojestto.pl/userfiles/file/31091717192.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/92871325178.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037d78fdd2---rufafevudagudos.pdf
    • http://phongkhamthienhoa.vn/images/files/15149750970.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_off0000ba6d.bin
d67f37fb72b5b55597f5414f137e57958c168a44e51c303857e2a02246c24f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16276 bytes
font_01_sfnt_off0000e3a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 16792 bytes
font_02_sfnt_off0000fbbd.bin
5a868258ed436cf575062942a3f402d92005279d46deed4f0873a0e9161b29f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 10536 bytes

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