Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0d8e5cdc4deb02…

MALICIOUS

PDF

89.7 KB Created: 2021-10-25 08:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f37bb42bd5cce2cf35baa65dee9d4f0e SHA-1: 129c85a057ce157bb4784a56bd07ab0dde154d73 SHA-256: 2c0d8e5cdc4deb0245376bea72a79426f029efb6d3375504d531e74bc3f32079
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a large number of links on potentially disposable hosting, indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aftp.bg/userfiles/file/kenukusapafuneduru.pdf In PDF document text
    • https://costabravas.com/uploads/localidades/files/16323968393.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bedamoku.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/97257412336.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100908120368067.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/82639769747.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/sakekukaju.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/93957408677.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/sugafidamaguzawurexu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zerareruzapa.pdfIn PDF document text
    • https://konferencia2014.medius.sk/userfiles/file/617873701.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23602934187.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/2245937433.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7868b518---navidegolasamowebugulaka.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/nebuwaniramuw.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/64837973490.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/rijamawovenovuve.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/loset.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/16444781221.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotipovivetewazejab.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/tasajudipizimikar.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/rumufobulitulavade.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/7923276180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=rules+for+changing+simple+to+compound+sentencesPDF 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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 18456 bytes
SHA-256: 4f53ee98f033e4f6a210f01985c9291e1b1b881e2c0edf6f96ed55b0654a00a4
font_01_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 11212 bytes
SHA-256: bb7da3564a936f1058c0561796cc1006be9344bf8e77859fbbe9bf0f10e37d84
font_02_sfnt_off0001409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1