Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c9ce7f143048c7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6995c4fae0dbdb326be02448188d447 SHA-1: b104b65520f176b8b4c2b6c551bf0d3a61a3c8e9 SHA-256: d9c9ce7f143048c7b8ed54bf5737c65bc364540c788f18393b52221855f0538c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded links, many pointing to domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://youxsoft.com/uploads/files/xuponorakulekagizamulege.pdf In PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/bukevunebumakabi.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/takeniba.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/rumazogipiletefabarorobez.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_FF2A16EFE2770F79.pdfIn PDF document text
    • http://workontext.ru/media/file/terarugusus.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/sunepeserisijoxewig.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/68213480770.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/5527638361.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/99453090345.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/lubatuwekekafuraleve.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/47736476632.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/mofasexaxafadurajejadu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34821924328.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jasobejoz.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/16485194776.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/guruwojagumerefaluse.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/35556686306.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/mupojufuzikuxi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/wesiwopatorenomebiwowabox.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/86677033661.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/42544818631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=distance+and+displacement+pptPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 10456 bytes
SHA-256: 54cacb9c5b4769971808849cbfb5ce4d84e0115e3d5f72c9431912adf3f6410b
font_02_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 17012 bytes
SHA-256: b93f94b90d8f67fd205d4e913147e3a01b44a7feb2d8d66e4e5b5683cafc8b4e

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