Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe22d10b6581b53…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097a878d18081e5291a4f2319a6eb627 SHA-1: 2c9dac2107c4d35d0ab4c5aaa2cd6c808bd69cbd SHA-256: dfe22d10b6581b5398005abef357a231745bd099d8068b1ddbf179aa05d483a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fgosvo.ru/files/files/telodulaviz.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49505093589.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/32992377161.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/pexixuvu.pdf
    • http://royal-pizza.eu/files/file/zorulir.pdf
    • http://tizianaiberti.it/userfiles/files/lovagupoxofuluk.pdf
    • https://stormester.no/files/file/jiwitusajiwuxulifesiwuf.pdf
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/63546991935.pdf
    • http://hoanhaochemical.com/uploads/files/mefupetajurimonefumika.pdf
    • http://alwaysshine.com/fileimage/file/wonevajijuligesurixamarat.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc054c294b---muwoz.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/bogapunibovasalo.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdf
    • http://adveotec.com/img/file/rirowiwosizogoletojogume.pdf
    • https://perfecthospitals.org/FCKeditor/file/wuxalepanaxedijifikumuli.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913085959.pdf
    • http://wildpflanzen-planung.de/file/gajisilatoketipav.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/34514940299.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/28101891237.pdf
    • https://bikeid.net/ckfinder/userfiles/files/55254425365.pdf
    • http://ratchee.com/ckfinder/userfiles/files/dipasoguwopimapatobaz.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a703e236---13641664955.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=descriptive+words+beginning+with+o
    • 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_off0000d9c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
font_01_sfnt_off0000f1dd.bin
b6ec2bd3e2fdcd0a63dc555e85a1f666a14833521a8879844baebb0bdf91986e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10880 bytes
font_02_sfnt_off00010a91.bin
01397d82804bb7388553c9dd8bbeccb43ee3bcd70ae49295418326d307897757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 17024 bytes

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