Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df9a8b82e12e4e2…

MALICIOUS

PDF

96.1 KB Created: 2021-09-09 16:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e993ffc644c50f2a7dca4f4de0825e0 SHA-1: ffc5a1f1c371191c71427dd51dcc45eef690e9c4 SHA-256: 7df9a8b82e12e4e241baaca0200657a2703cfc1a38954486417afd22dfd434b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cualuoihoanmy.com/uploads/userfiles/file/zazewunopememem.pdf In PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/vibawufiva.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/84700509296.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/57993008695.pdfIn PDF document text
    • https://tch.lu/files/files/9556789404.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210903_E142FA449AB6730A.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/32903007563.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/82992695114.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/92371558660.pdfIn PDF document text
    • http://telektrans.hu/editor_up/51663465961.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/23f16e2af85fb301541a8f9630a5a42d/87879027144.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/vaxifuwamatezoxonowubu.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/53148739437.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/12491132611.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109022032361217.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/84873970658.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/tasogipuvepezuv.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f353c7343---38067296515.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/29857234169.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/lageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=parent+directory+series+vampire+diariesPDF 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_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 10808 bytes
SHA-256: 477eab6edb602d2d4d5fc410ac467729dbaa4336a76bac1db80a89c0824a4146
font_01_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14336 18436 bytes
SHA-256: 2c28cf4555b373450547e8437ac7aeb0a6b98fdc29c46578b131c4fd052a076a

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