Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fb6df4ddb7ee8f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 16:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da84edb129f56f027d052366301014b3 SHA-1: 34f09e4f6d757157f151217583c8b0f96ca88344 SHA-256: 13fb6df4ddb7ee8f604a404ee60d8d607154aedf63698b5fcc617069dc57a2be
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates it's an image-only document with a clickable action, typical for directing users to external sites. Numerous embedded URLs were found, many pointing to disposable domains, suggesting a link farm or redirection mechanism to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://seedomoretravel.com/files/files/73995506814.pdf
    • http://talani.nl/userfiles/image/file/94690618412.pdf
    • http://www.gabrielamaciel.net/images/content/file/65754121038.pdf
    • http://firegallery.ru/img/upload/xexedetupagedoxutosawup.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/zozarugixitizotavemafosow.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138abfd59ddb---58718997295.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/60171654288.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/70428998898.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/eooskmga5m5r9m0grejbofhoq4/fasofujidiwob.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vanaguvebivejisugav.pdf
    • http://hyeminshop.com/DATA/files/42616485088.pdf
    • http://abwalabamaave.com/uploads/files/kobozalememajoj.pdf
    • https://ottopianos.nl/files/1705333830.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/gokevipobovozediku.pdf
    • http://sergeybazarov.ru/file/juxepetimojatupad.pdf
    • https://digireg.it/upload/64280146252.pdf
    • http://neogmbh.de/www/sites/default/files/userfiles/file/8686089215.pdf
    • https://samoinstitute.mn/uploads/assets/file/rudakesevukagibilugodanuj.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/sesikuniv.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/zubetarilujalumo.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/luterefa.pdf
    • http://www.almansori-ye.com/almansorifiles/files/18644415640.pdf
    • https://akamercedes.com/images/uploads/files/24559966116.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fight+streaming+websites
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b263.bin
2322d8bffb8432209c842d7f826ffa0312a09fc7678c83773f30ca7b3203731d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 14084 bytes
font_01_sfnt_off0000d518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
font_02_sfnt_off0000ed2f.bin
e8003fff1622e3417798e1c441f3557bccd67f19439e4b7334a7dc4bb6fe7fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10592 bytes

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