Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4dc522d2356e3c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 13:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a96935a03685fabd7ceca40e873df68 SHA-1: 5828ebd2d7f113a42d67d990a0f7719e646bcc57 SHA-256: bf4dc522d2356e3cafc63697b46b806131a11ae336eb6a6982dd4f9d758129a3
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. It also features numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for information or download further payloads.

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://workcoop.org/fckeditor/userimages/file/20210903054545.pdf In PDF document text
    • https://hanedantoptan.com/upload/files/67127512852.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/1810875056.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/suwebuborufigojajozu.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/70716280346.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/68620109566.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/36984795316.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/64445120434.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613872d4764d8---zikolobegijor.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/nifemo.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/18072790297.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/bekipilapowo.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/35978674168.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fozogoderoxan.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/64119398073.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fogunajowakifuvazolujogij.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/lowifezebuloduxa.pdfIn PDF document text
    • http://bibonatura.hu/ckfinder/userfiles/files/86848323781.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/rozuxopenosapa.pdfIn PDF document text
    • https://stopserv.ru/files/file/98547615016.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76b3708b---gesoboxuz.pdfIn PDF document text
    • http://philipsphotographystudio.com/64720163187.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/33616143711.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/linowitozegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+font+keyboard+app+for+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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 10844 bytes
SHA-256: be6973b082827681b0ee361e0be62942b32fb0d9c0e5698e8f3a2f80b0d90b37
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16948 bytes
SHA-256: dfacb178d2ba3048d9b30f6a3959d47fc27aff2d278cd56768c3d442c2c25079