Malicious PDF — malware analysis report

Static analysis result for SHA-256 da14b2f4d5102a00…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 04:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b91e1dcb90bffd748dc013ecdc0cd8f5 SHA-1: 732ce6ce29bb8cd9940ae5042d4a6dddf1b5cef0 SHA-256: da14b2f4d5102a00d95d8a06e8b2d94099bcb078d32927881fb00bc3a9b3a265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

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://prestinieurope.com/userfiles/files/gixaseme.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/93351683918.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/nagakem.pdf
    • http://brlairport.com/images/file/94997059096.pdf
    • http://www.miwon.com.vn/app/webroot/uploads/files/17155498202.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef76380995---zigovusawasusariwofaliwe.pdf
    • http://eternoohydro.com/d/files/jofubes.pdf
    • https://artemishosp-em.tw/uploads/files/202109220817346556.pdf
    • https://luckysurface.itweald.com/uploads/files/6144da3d57167.pdf
    • http://maydemtienvn.com/upload/files/ruferawunuv.pdf
    • http://huiking.cn/uploads/file/221836591896.pdf
    • https://widepolymers.com/userfiles/file/90402142574.pdf
    • http://campfirewtx.org/userfiles/file/kavizawozixisajibogiw.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210913_FD34CBB123CA25B1.pdf
    • http://icltindia.in/userfiles/file/lukekejerunoguvomiwezas.pdf
    • http://whdhgs.com/uploads/file/20210925190009751.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/zedaxoragabu.pdf
    • http://phantasos.org/userfiles/file/lanisivoduki.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/kanedaditilomoda.pdf
    • http://prota.ru/upload/files/59823248721.pdf
    • https://www.netcorp.hu/data/editorfile/wulimugilefaxetarel.pdf
    • https://travelworld.ro/userfiles/file/gunewimimup.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614783341fd83---dabusofovo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+android+app+download
    • 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_off0000b284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16792 bytes
font_01_sfnt_off0000ca9b.bin
5ef17129b5f5623da3b1b0996017aa1f545b00c8b02e162ac8629c8a0527bd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 10408 bytes
font_02_sfnt_off0000e248.bin
29fa20ea0173a40cc9e591249d30cf6d1dfa759410ba5d70ac7318636743660d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16076 bytes

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