Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dde74a5bf3f82f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 09:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b94bbefcfc36e6e470df8d124f27f29 SHA-1: 2d1c9ec3b821469d76fb36159a4352e01ac042fe SHA-256: c7dde74a5bf3f82fc314c1fef0d45ba00777fa1ecc1f122cdd07ac99a3a0c4be
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=tone+types+in+poetry PDF link annotation
    • http://heryeryesil.com/resimlerfiles/44086583353.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/46324307560.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gopovovola.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/7214515492.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419f6f245d7---3265473519.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/kexebaw.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/609417214.pdfIn PDF document text
    • http://innotack.com/userfiles/files/27519431041.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5bb703a7---vaxugonilegejizurupi.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/94001337549.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/29144868731.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sumeg.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/86685105841.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/26701039515.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/luredepemu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31260680835.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/panelimipojexu.pdfIn PDF document text
    • http://zgic.ru/!upload/files/10956578467.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/muzamagopezipuzupujita.pdfIn PDF document text
    • http://dongphat.net/upload/files/rajonimonenujobitos.pdfIn PDF document text
    • https://basisnomor.com/contents/files/58824999072.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/puxewikipul.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/zirazapumodepo.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_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10116 bytes
SHA-256: d230975a6419613d72750c94fb32309a247f92df8a0f9cf69fcee22d694ef3e3
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16228 bytes
SHA-256: bcc138856bcc1084f22fb30ff5af07291bb60dd2b9a7d768445aa8b05d03fe00

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