Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ccf805334dd819…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 12:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d8f72f7a5dd0324bacf79a1f1b2eace SHA-1: 70f9eef7f93bddabe06b97954e2d6e81d0907eee SHA-256: 66ccf805334dd8193f20c9aa8a953e8d9a02076d677a23722406c9e3c7c6177d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=iphone+se+not+downloading+apps PDF link annotation
    • http://eluvial.com/sites/all/sites/eluvial.com/files/62854560971.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/talejivurudobuxebax.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb54c28e9---melajonu.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/fepomelivuti.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lerimejubiba.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/30189628902.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/54751315418.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zubewipuzakezinuk.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/16867958895.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xipiselobobibum.pdfIn PDF document text
    • https://amgaa.org/temp/files/5667384630.pdfIn PDF document text
    • http://ellev.fr/upload/files/738500529.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910071732.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210918_65E987D08B236BF1.pdfIn PDF document text
    • http://asid.rw/userfiles/file/saletatevijilalewavu.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/xopobon.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090105060373499.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/wozoxolezojijumudananik.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/74167957593.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/zuxojinibi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/u8ku45ph3c2cs1udjmoj6hgil6/92268087103.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zijolimadogerasedosezola.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/78462106569.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/45506940414.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/29066992153.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 18068 bytes
SHA-256: 15158808480a6adaa8d7835a295d62eedf32dd7a4439c4de0a97e2292f09a904
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 10608 bytes
SHA-256: ce489617df5a07e545e32cae0719d17e2a36c8393d6b313f1a1fe9bc307d9619