Malicious PDF — malware analysis report

Static analysis result for SHA-256 9146bf84481021c0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 19:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d55a0d7eedaa8ca2439a57e4bbfe456 SHA-1: 6ecb8facd0e70a06eb2b20c324dcc39d36928698 SHA-256: 9146bf84481021c0d01b0f84a778494efe3637b8fb0132e9304c83f6df7bcf8c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, with multiple embedded URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://studiotecnicobonoli.com/userfiles/files/25296141184.pdf In PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/wumunezeg.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xexefibum.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/74262030969.pdfIn PDF document text
    • http://gro-felix.si/uploads/46993280548.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/mezazewibidel.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/9590449821.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/negimegos.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/derebajisifi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f02025ca8c---21585545763.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/18543720400.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/vaxezutitanupiraladavimen.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/64943134370.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/10973341099.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/2025361401.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/patepejupewoz.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/41212654326.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/755086549.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/pafikomikaje.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/80121422357.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4299d1f4f0952ecaa92827691b7f9a91/71738539351.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/masobar.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/rilow.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/wotokuboli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+reverse+tethering+downloadPDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 14448 bytes
SHA-256: f3b4e934bff1939c548fbcd74c136668c14fe6bb005e9f16aa04294089917a35
font_02_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10660 bytes
SHA-256: 7c546c04a4f8b163b0cd7ada0ccee488327ecd5bfade6533aae56f78c49a576b