Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce086f582f85998…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20cdaf9f879a942dac9ce99fde8383b3 SHA-1: bc12df3875d667b0b38800a5d8d8abe410d39a38 SHA-256: 9ce086f582f8599807b5a9a11f6c6edc4fb88e5604ca9c9d9bdee8f578e07442
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall phishing lure. The PDF structure and embedded content suggest it is intended to direct users to malicious sites, likely for credential harvesting or further malware delivery.

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7b3f81879c94c5ca6cd02860e4b58f35/nubutajemuganunaj.pdf In PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/fokazunof.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/68936070414.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/65877688807.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/72777825009.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/riginumiroletefafibadad.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/23510269970.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/tekit.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/nivimit.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vejojew.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zajeselaxabipubanurog.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210917_9C32460235707C6E.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/96979353903.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/18661249170.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/60208501559.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67559914591.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/povisanujebapizudu.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/28147083744.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904144539_219515617.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/70838675104.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505e69109f6---kiperevudura.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/8172396011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=swift+dark+substratum+themePDF 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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 15164 bytes
SHA-256: 6abc0923e1017a4f310b3996a1b5845b3dd399f0681a7dca0debdedf44f6eece
font_02_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 10840 bytes
SHA-256: 2967769cd48dcfb337eb6ac01b9142f4b60b42b65c5dd34b3d3f4824f8fe9e57

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