Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f190946bbfdad7…

MALICIOUS

PDF

90.8 KB Created: 2021-10-04 12:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f8fbef9299fadfae0d3bbe018d88a38 SHA-1: 61c102becff122588512caf3a7075c459b348c73 SHA-256: b1f190946bbfdad7add71bb2bc33eac92f201d808d565637017aa1deb3867b69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=angels+and+demons+read+online PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7a79de22f3dbbdc94fac17e1684e69a3/9346021500.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/24084579019.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/99357962686.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/rodedofinowadulezi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/tiwowixuno.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/45445767368.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/jexekazikawojekefivun.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/foderaxobuwodonumed.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/73797309221.pdfIn PDF document text
    • http://hanifeugur.com/image/files/zorovexibovokosat.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/dogeranupetorugel.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/69623177335.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/31661546905.pdfIn PDF document text
    • http://abnicum.com/files/file/79695260080.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/biwunemegizixiv.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/95966197190.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/lilaxuzokovaju.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xujuwapazugisufitizudenes.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141129e89084---81685841839.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/31166101918.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/70575333719.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-13/20210913163251770164.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/91322177816.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/50409913320.pdfIn PDF document text
    • 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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 20780 bytes
SHA-256: 2708f07c9e469862bb78a33d466603345bdd59b36b22a99a3a2131120f0b989a
font_01_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EF 10476 bytes
SHA-256: f106375e0c68a1632cb29f255debc86e3fb71ac999735ddbb8bb50e4e7048d48