Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6799c1e65ff3196…

MALICIOUS

PDF

66.6 KB Created: 2021-09-28 14:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18021ed12f7056f812c73a65b56c9dbf SHA-1: 24a4d89b2d03945a553e8e13a67dc7d31151d0ba SHA-256: b6799c1e65ff31967e6269953b6748532a3444e9056351367d5550c659031d12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://budoprojekt.eu/obrazy/file/88530424426.pdf In PDF document text
    • http://artattack-concerts.de/files/file/kobuxatevuzuv.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/tijegotofowukuximefozo.pdfIn PDF document text
    • https://mattress-leader.com/media/wekotuw.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c807eb4e6---fazelenazerajusave.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/99959141095.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jofifajakowomakafek.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/zarudavulividira.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/47574129155.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/38898525802.pdfIn PDF document text
    • http://carszana.com/image/upload/File/4102111300.pdfIn PDF document text
    • http://sswjeans.com/files/rixexeso.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443722bae24---37380801822.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/64721335260.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/85058047603.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/30502271111.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/88742098054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+create+shortcut+in+parallel+spacePDF 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_off0000a78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA78B 10648 bytes
SHA-256: ab5bb658510609b1c1415a426de2acc67753cd9515bb272ad866745cfb0ca89e
font_01_sfnt_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 14832 bytes
SHA-256: 25536d1dc93066393b66c132f78dc45a905d4ca0fc28f6b70b3c112af7c0d7e6

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