Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fe248669d98df9…

MALICIOUS

PDF

95.9 KB Created: 2021-09-15 13:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a61bb4ee77ad551e7e4d1a7c1fef804 SHA-1: c80f9e456d51790bb026d6721be9fccb4d1e20e1 SHA-256: b3fe248669d98df9f79ff4f7f0fac1fe15b8cd3968b75f1037bf649405c85370
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many of which are 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 the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0818a50c0---bidufow.pdf In PDF document text
    • http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/poperobefeferuxik.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/debepopunopaxokovezojeta.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kuvejo.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/sozetakokugeripovaw.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/96931380320.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40385779477.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/mesup.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/dugode.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/81909048902.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109100549576286.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/80054049736.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/72082550550.pdfIn PDF document text
    • https://netlandschool.cl/files/xijowilapigipo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161363b260a00e---wepinugogunuz.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/28572726290.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/46440106191.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///masitegetewenifel.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/47894164356.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50907777979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=harrison%27s+principles+of+internal+medicine+pdf+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_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 10808 bytes
SHA-256: 81c947790b7f3ef45bda28e6a23edd2c21034d0a849cd0ddfcdef6287de512d0
font_01_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 18024 bytes
SHA-256: 0ee3afe10dd4ebf7f6c910212a631c4214b19e8bcb176fc04d22aed4f57f959b
font_02_sfnt_off00015925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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