Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6cda9b3e42ba91…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 2b05f2aaa135963fcd2054bd47afc07a SHA-1: 203699485f6385690b7cfab37de7e8233e17c8e0 SHA-256: bf6cda9b3e42ba91aacfb0d988b44e54f59cefb51ca37a415d15e43c358c7beb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=miui+12+widget PDF link annotation
    • https://ever-progress.com/upload/files/vamutexiridefexezozoletoj.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/76469607904.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130442817eab---22596206310.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/zatezepofuseromax.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/47820499326.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/28938733973.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/13687472845.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pisukobogan.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/bexewofutanixitiz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kemebisutun.pdfIn PDF document text
    • http://dgjst.com/upfile/file/fefametafebubo.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rimimitafo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/rasirijufudimifivude.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/54820624470.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/70239203139.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pokono.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nowozotekixaderupujovu.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/zajajoke.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/lulizexenolunuz.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/pezojawurexavixem.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/936fdc260aad5dd103afaa31a4ce7c5c/zajezevaredam.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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 17172 bytes
SHA-256: bf1bfcdf1668dbca42492b43ae93724f16d459ebfdea4c17291c3ce28ddde242
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 10076 bytes
SHA-256: bf9d390aa14aa2add17a23bd69f8644b13b104fdee6a67aa647a1d9caf8ce6dc
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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