Malicious PDF — malware analysis report

Static analysis result for SHA-256 929d96af2de2bff0…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fa8ea1fb6d2298948846985b1fdb2bd SHA-1: 1657dd631e00217ed9962866a523281701c313da SHA-256: 929d96af2de2bff090519081cc5919d4bb15c84189a4fc885b572821baf89618
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The sample also includes numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://paliukenas.lt/i/File/dutorapubib.pdf In PDF document text
    • https://jotelek.hu/files/file/tudusixolubikef.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/zelosomipuvadaka.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/91460652519.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/mabirikukolilobij.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/51878570026.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/fabotefejiloresawinovuse.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021912537244849.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/lufibidepoxotowoz.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zozidor.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/37753960018.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/86770845222.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vuxovikoxomaror.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/55303449488.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/87538673395.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/gofokavovisulumurorax.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/xurerewaberizefa.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/94289321776.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/natono.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/55121597027.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pejodozon.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/78164964646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=instalar+google+play+no+androidPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 15868 bytes
SHA-256: a09aae6f5a7af42259235291ece0222021147ab8ba29159accdf374c2afb2698
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 10632 bytes
SHA-256: 650e7a816d9d4db5360f69927777a096106603698f3c17a39752bf737ebbb29b

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