Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e85810888cc1a0f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 13:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 069952ee5623a982081a733f41f0b3e7 SHA-1: 8e23919b4a4946a53b5353c70de272d99d4415ba SHA-256: 3e85810888cc1a0f3e5cdd249118c07af90d55e1b087fb31fb78aec6be412475
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a large number of links on disposable hosting, a common tactic for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=group+of+dachshunds PDF link annotation
    • http://media-production.net/admin/ckfinder/userfiles/files/91991698112.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/topegabubijilirazimexiko.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/gafodotuperufaro.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gusisopiva.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/72784815687.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/joxurolenuw.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909150910.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/9652185008.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jaxizalafolozazus.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/50396371688.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/2412291672.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/95194676613.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zugagidulolopube.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/94720666456.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/ronokobub.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88541384518.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dunivemilijagi.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gebawekewudegovenes.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/19773049068.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0e1807dc---4750463962.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/luduro.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/wepadukitisud.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_off0000bbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 16100 bytes
SHA-256: f245941272bb76e935c116af6176b4bc2a7b29a958fe98da4fece4233792b825
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10488 bytes
SHA-256: 0b51cfc294ea814b1e75454e182a8ac96a06d6e6a3b8891c3221d7503e196fe5

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