Malicious PDF — malware analysis report

Static analysis result for SHA-256 028fce5a81cde2cb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 06:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 320db8207749c97457e4b9d12ac4b2ef SHA-1: c9a77484520a80a73404eb62a918083eb0729758 SHA-256: 028fce5a81cde2cb298494db84f51c512958ea73bea8760e6c0a1d692c8bd346
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=top+5+best+editing+apps+for+android PDF link annotation
    • http://nincity.de/inline/file/posipavorefujaro.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/kavofosefoladiwewofufobi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/72149117486.pdfIn PDF document text
    • https://jobtiara.com/files/files/62239489375.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/86712528466.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/26215231816.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/8395093135.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sasazalamuva.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/xelulusotuzirijolusu.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/51298766888.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/larufijuwag.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/64575153217.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/75806826602.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/41107043211.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_574530AB7319B1A4.pdfIn PDF document text
    • http://marketingnews.fr/images/file/panasuribena.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zerofuvotuvotumuzanuzubo.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jupotepijoradag.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kakiparuwo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nojebugovazu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e305bef4a4---57485277820.pdfIn PDF document text
    • 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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 17568 bytes
SHA-256: 521e96ebc058dd8b3fcea044d1fa6f0e3244fa82bb445fe9544239a6300a6970
font_01_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 10864 bytes
SHA-256: 02117b94347ec49656c60756dbf27add5cea67c2b016d51756b8b72288f186d5

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