Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc54c371c42178c9…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 19:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45ed9fa80a0250980df4f70d5fbdc628 SHA-1: 63d653b1e2416273cfa774299ebdaef3a9ebf688 SHA-256: cc54c371c42178c9fe7d01c3f0a263b624ec63ce9f1b92a15d6f7f42a5006400
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-only lure, typical of phishing campaigns, using a screenshot to hide a clickable action. It contains numerous external links hosted on disposable domains, suggesting a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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 https://drafthe.ru/uplcv?utm_term=ubersuggest+sign+in PDF link annotation
    • https://tmtteks.com/files/68294523919.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/3108966342.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/gibosezejabixegewaxefim.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/radokiniso.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/dipuro.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xunimokigibugavof.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pusafigamu.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/17769124529.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/99022437920.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pixufosifupilabetejab.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/fafizu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614575312b695---76345660516.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/75922258877.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/65870280664.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/58993311817.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruvozudataxe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613795037b8ef---38269334145.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/6660980085.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/kituwunaduk.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/13232848624.pdfIn PDF document text
    • https://0908108108.tw/upfile/files/2021/09/26/57076570081.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bedarutuwiriniwezutadal.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/58500953209.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 14340 bytes
SHA-256: 524a9500962dbdcd4ec937e60ccd9f1dfd207d4638c2ab8773ffbbb4adfb6c46
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10204 bytes
SHA-256: 31c2e349935e8083a08436b13eb2ad709666dff7d0f9e85bfe060e782a896b55