Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f27819dfa0c80b6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 22:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 133701126b95ed9e3b3ca0889520a8f6 SHA-1: 511e2c0d0aa955bc0f38bdc7bf1446d535db805f SHA-256: 5f27819dfa0c80b683638465a7ab169b55a725be2cfa9cd9d46678d428e00447
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to other PDFs hosted on potentially disposable domains, suggesting a link farm designed to obscure malicious intent. While no scripts were extracted, the presence of many unknown URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://prestinieurope.ch/userfiles/files/86121040134.pdf
    • http://gidaero.com/upload/fckeditor/file/79173111753.pdf
    • http://geodavidepini.it/userfiles/files/37680161570.pdf
    • https://gmnavarra.es/ckeditor/files/rajojopaxofopu.pdf
    • http://lg-palette.com/upload/files/tesozodamimapaxuparaf.pdf
    • http://askaudit.ru/price/52177392949.pdf
    • https://zivotzaokny.eu/res/file/mabow.pdf
    • http://thevale.us/userimages/fabukaziki.pdf
    • https://ntct.dz/ckfinder/userfiles/files/33682128294.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/fajipamavemageji.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/bedejakoxobigab.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/85231870919.pdf
    • https://twinslock.com/ckfinder/userfiles/files/juzaw.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134998cb05e2---48728889271.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/32617560352.pdf
    • http://www.uc-kushiro.net/images/library/File/sizolelelovomolenegina.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/sugubil.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ade314729---kudikivuz.pdf
    • http://madonnina.info/userfiles/files/80412305571.pdf
    • https://kirbas.com/img/uploaded/file/zagutugeruwebafut.pdf
    • http://chapraptti.org/userfiles/file/52962514391.pdf
    • http://violetstudio.in/userfiles/file/83174999618.pdf
    • https://homeuu.biz/upload/ckeditor/pages/files/tolilirularovibepavorepu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+ikev2+native
    • 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_off0000d441.bin
e0be284f2990d3683a20c6d89d89860ad3b79202ff57149ad0c7f950712e4a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 10288 bytes
font_01_sfnt_off0000eb9d.bin
474af9545267bd1deb429b22ca98adc76ff8a8d7c226d8afac2a42f72ecadaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18880 bytes
font_02_sfnt_off00011d94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 16792 bytes

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