Malicious PDF — malware analysis report

Static analysis result for SHA-256 afec06f77efed4ed…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 13:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6534aa4fd255d0400cf6051086028b13 SHA-1: 074b1aa30b1e16d14a8bda5a4a6e846aeb7c1151 SHA-256: afec06f77efed4ed5bd38ce3f01093c8ad687235a459fb00559ecdeee717a631
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vytvarnyobchod.cz/UserFiles/File/zufufijuzuma.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/80274022434.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/takevutiraxop.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/dojidazofuleva.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357c0f5d863---52844692545.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/93000195446.pdfIn PDF document text
    • http://markone-tools.com/upload/files/11662791780.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/3666056817.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/27938097526.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/17448622214.pdfIn PDF document text
    • http://fteq.ru/files/file/fewexegukeboloronopi.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/51684195340.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/bixaz.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/29586354787.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/voruzasalujekugilorinogup.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/rovirus.pdfIn PDF document text
    • https://soechi.net/userfiles/file/revow.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/sedefisekogufunub.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/pagexaregaxibi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135889099a0a---gadif.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/gisufejutevu.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/kawexubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=drag+racing+cars+gta+5PDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17756 bytes
SHA-256: ef109fdcdf2ad28449e4260001c4194466230e69d1a12eb949058ad139413d78
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10244 bytes
SHA-256: f19e441d4c35488e408995c97adbb094053c079e0ac7166fcbea1664de7e7508

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