Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c54ce3849a5c97…

MALICIOUS

PDF

88.9 KB Created: 2021-09-24 05:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34e6951e11798c3fcff82bbb91bd4a52 SHA-1: 611b71cb626b006bfb3979bd3181c03e2f654228 SHA-256: 91c54ce3849a5c9767ce51b007fa8e4c8237180c948169f8938fe32ad7456d1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=watch+drive+2019+full+movie+online+free PDF link annotation
    • http://eunlocker.com/Images/Editor/file/23112952880.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/zatet.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/67441732271.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/sovegidaz.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/3435161024.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fatenaxed.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/27976389558.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/todotopevu.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/75570944874.pdfIn PDF document text
    • http://scro.ru/pic/file/xudifujatotava.pdfIn PDF document text
    • https://okazionche.com/files/jaminumibawafupope.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/fetit.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613877aa4bcd9---56720898148.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/13863216978.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/roguxoxiwanuvuvaporaseje.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/65613684922.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/gavemuxef.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161439881a0021---23434048933.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wawen.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/2308615905.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/48862846688.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/14155197475.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/lodiw.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nuwope.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_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 11196 bytes
SHA-256: 0e7f5a8ced272797a8b40c4f49685765c3f936e0c176c76413b47b935f367fc5
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17788 bytes
SHA-256: 2c47976f17a7c942e49c44ba3aaef0722727b93557248e21cbf912518ceeccf9
font_02_sfnt_off00013de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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