Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f14e9d58df738cb…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 00:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73b81719d842f02d1c61422c0c177130 SHA-1: 86dbfe61094fb0a312721b57792458abf937c85a SHA-256: 9f14e9d58df738cb8d70b1e964373f2d729c6b264ec345ca2bc35d8a4e2d9de1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://rippa.pt/files/file/kujonaritapawujuranuben.pdf In PDF document text
    • http://hcbarrett.com/user_area/file/nilutezajotejimajug.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/63329819299.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/8050305591.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb440a754---48390248274.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/34033775686.pdfIn PDF document text
    • http://jarosi.hu/files/file/zolinomusazumovilotigumot.pdfIn PDF document text
    • http://espwireless.net/uploads/file/35821749116.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/72109639218.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/puvukekidolizokomizusa.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/favejefosutafedi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/74807749146.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/41710675053.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/padupo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/58644152985.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/17677647316.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3dcb3947d---tanixopos.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/95931240707.pdfIn PDF document text
    • http://egitara.com/upfiles/files/nomebapelowixakifa.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/36167909776.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/binovalabowilevapuv.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/lekapuxomafexe.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/47183110683.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132edf07c6b7---73366573284.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/78068760939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+unlimited+robux+2020PDF 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 18356 bytes
SHA-256: a7b5ae952f04ca3f96428eb34c04c951ef45f73514f972c539ddd57f8cbd84e7
font_01_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 11028 bytes
SHA-256: 0f446c597c3b2b34b33445459470d7c6156b77f47338317fc622f79d456cb5cb