Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fad24dd11d6280b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 23:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2cb3af8d88ee570935f024953b4e7ef SHA-1: 122fa5b92518cb8e31c632c8dcef186e487d2164 SHA-256: 9fad24dd11d6280bbcb019967dcbb3c84bbb8fb91d9e263e05ab5665c56cdbde
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is likely responsible for redirecting the user to external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the sample is part of a link farm, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its harmful nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://shiprapublication.com/uniformkontakt/userfiles/image/files/14785516301.pdf In PDF document text
    • http://hongdacable.com/d/files/vewirilinevepuxed.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56289729329.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/44975155290.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/sawaxalegosabaxapekugut.pdfIn PDF document text
    • https://maria-galland.ru/files/file/82150669236.pdfIn PDF document text
    • http://retailcop.ca/files/76904197871.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/nonozutedo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/566c629f3dd5dfb20afdd702111daccc/99972376907.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/disimelo.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/735610174.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/28300822735.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/zazimobulul.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/34907259593.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/44047769150.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/25610123767.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sinediximugigadevirun.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/juzofirivurujezugedop.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5ca424d842320ed61c68fabb4e7d4e8c/84561903822.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mefenefadusifakesixep.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/runemazutavodagowalo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/13477356525.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/25256448286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+cod+mobile+pointsPDF 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_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 10632 bytes
SHA-256: 32fb33e9f17a149eb20ac36557c351d5fd91d2672a5ae1399203f07716a75580
font_01_sfnt_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 17408 bytes
SHA-256: b20bee152fcab22706adf52b5722e104273d095dc97c273bbbed50a26c5b0afb