Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b946b558ea3d54…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a3b6a614fc6d64a2b373c2c6c30f263 SHA-1: 550425d048066768429b24878d7be5003a1d198f SHA-256: 33b946b558ea3d5470e6253ec9759692d7626ad652ffa4276750fb2b036f78c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link aggregation. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format suggest potential for JavaScript exploitation (T1059.007) to redirect users, likely delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kant21.com/userData/board/file/tavaduwufetevigigepi.pdf In PDF document text
    • https://sukaunited4d.vip/contents/files/30165988016.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/duletozejavuwos.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/36961341982.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0cbf438501a21e4e32665189f37aea8/sepanubotizozaruv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6c0862a5---59590997759.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/pomasobo.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/80391262211.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090515021197.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/nusikuxonuxunadeleb.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/tufevibazufef.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/47798147513.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/99890288618.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/finujepolagemasuxerag.pdfIn PDF document text
    • http://qdjshg.com/files/file/nofijixuretosap.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/96018914175.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76246405895.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/20986548843.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/davitapilufoji.pdfIn PDF document text
    • http://baoveantam.info/upload/files/zanozuvijolazozomoxosit.pdfIn PDF document text
    • https://777mto.com/contents/files/solonuzefiveze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=real+credit+card+numbers+that+work+onlinePDF 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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11100 bytes
SHA-256: 7ff505796486a78633f5825dd14072c45e22680ba7f4df2effc3407e67957055
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 17936 bytes
SHA-256: 5132ef0b5f39c7f313c794c519cd6aaf004626c0365d95d4fbc195f6031c2f82
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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