Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ff22730cde9c71…

MALICIOUS

PDF

73.6 KB Created: 2021-09-28 04:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f638996878d060064e0ca71b5eb17ecf SHA-1: 080873cbd73b550dad5c1518ae89606a193bcd9f SHA-256: 23ff22730cde9c71e747664ac425a2b87375eb817d075e4c8d45951df2035f8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with critical and high severity heuristics firing. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://infrive.ru/uplcv?utm_term=john+wick+chapter+2+full+movie+free+online PDF link annotation
    • https://27061010.com/uploads/files/202109190542547805.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909212525.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/65054945171.pdfIn PDF document text
    • http://katela.net/userData/board/file/fivovobe.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/tujibek.pdfIn PDF document text
    • https://izr.fr/files/99014959490.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/47173227395.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60094389071.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/58399368870.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/83280455772.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feee4edb5e---rusozutinopuvizijiwu.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/6241417629.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rerijofikupiwuwasiw.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/tudepozaxamagopemegu.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/68631333439.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/12835703214.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/74847068948.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e360a45e31d1eb770f3bd3bb48ddac81/gixumuletawijabare.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/4250723486.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/65327082591.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/boxatuwowuzadixoxizativip.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/papowaxano.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/jodolalugebizuputuxi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/43012969972.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/roguge.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/vogowadafowujafalede.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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 17584 bytes
SHA-256: 6f0f929356c5c0dc2c968ceba8a64b02d35174d36ffcd798e0115f37eb30c9be
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 11032 bytes
SHA-256: c7eb08aac5bf08f84f355af41e392bf413539240a0566fcbbd3e7c56dba53646
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1