Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4fa4faf39fcbd3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 22:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22e6ecee319fef9b55c729af8e1191b7 SHA-1: ab0295c6208c248beeeb38f49d8f2c916f041c15 SHA-256: cc4fa4faf39fcbd393d223a5e1c7c3e771ac2ff6db6b2e761bdd7c2b4628b587
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sarvodayasamaj.uk/upload/files/23713875140.pdf In PDF document text
    • https://detector-billetes.com/Imagenes/file/puronoj.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/suxaxijavova.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/41618046573.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69362982945.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137e6e2d5503---muwivutizazoz.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35338330520.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87723088933.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/fibazixewavabixedezojemox.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/33641858341.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/kukumivotuvudoz.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vorugopupulurigujenixivi.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dasafavabaz.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gudidokuxumebixasoxojeva.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/jusugov.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/jodumugenalonare.pdfIn PDF document text
    • http://www.polni.si/Images/files/sijokijiruposufi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613638696b9f0---nirawabupuradi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/dixinemasezisuxerugewu.pdfIn PDF document text
    • http://www.ezmoving.com/file/bexinelusadefulusananudo.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/fekena.pdfIn PDF document text
    • https://dukupahit.com/contents/files/9193738086.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/59645073002.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/82738916011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+download+the+king+of+fighters+97+for+androidPDF 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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 15504 bytes
SHA-256: a8434b4f87af1be3486df2a8f2e8f074a58a71d70aeebff82e3790604f88a10d
font_01_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 11008 bytes
SHA-256: 51ab0d4c8c5761f6ef35218391cfaebaab4e3371421d21f02cfcc2ffb06419d3
font_02_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1