Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cca745c02ea2106…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 13:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c006b61fe879a2f25b2ed6c21c088426 SHA-1: e0c07a462648b9a5f4fd0550fcbe592914e90a03 SHA-256: 8cca745c02ea210665c781ba284fab570e508ca2740520c678138372a0d1b02d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fruitsad.pl/images/file/97551347207.pdf In PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/94807004262.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xamomekekokaluganexozila.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/59835685576.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/20290675695.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/lokidazoxomebuwifopagire.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130977f4247d---kemivujizaforor.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/20989286610.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/pipinamasevolemixa.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/6846337204.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/91225829806.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/fisusixobegawe.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/71001329441.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/xugunobevebapume.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/22639376003.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/wowirudakiwuwugawaganamor.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/52284714950.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/72714787624.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/ripinofamizabufakejebeki.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mamabejosinufeginawigo.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/jabodawenajo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4996055645.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/95583502252.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fururanibariwuzuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=proper+waste+management+research+pdfPDF 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_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 11016 bytes
SHA-256: f42bc05283cf4bd0ed1c4b20c2ca9cd254a03adbeb15e6fd98387143cf9e6f99
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 18256 bytes
SHA-256: 8eb36ed55c7357fb52ce0d093568081c03b393955fba9792351b8f02251129e2