Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffebb6b1b37958af…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 21:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1075aa07ccd6bad52bace5fefdd7dd94 SHA-1: bca83c519f7268d53a296d08e07b4fe7c3f04a18 SHA-256: ffebb6b1b37958afe0d974dfdbabc64d05dd97ce1b8e87105a093e043c186ef6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ijfbacknumber.com/editor_up/33096665905.pdf In PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/26389910587.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161356c060ca11---sanule.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/pozipunetunopivem.pdfIn PDF document text
    • https://akemi.ro/hirek/file/55960305908.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/19214649912.pdfIn PDF document text
    • http://inercial.es/uploads/files/54555027868.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9b99b17a---32668683368.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/14413057601.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/tawuxomokomotudufot.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/48609977713.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/fulidofafasigosomidurek.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/59268617136.pdfIn PDF document text
    • http://sinostandards.net/upload/files/45485906124.pdfIn PDF document text
    • https://wonkingchina.com/d/files/tiloritej.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/19206361911.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/38479889070.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109081207406540.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/72158533052.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/rilezetawudunigegasared.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/miguladisozegapunixelufe.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/33115145008.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/denubevun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=append+pages+to+pdf+filePDF 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_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 10552 bytes
SHA-256: 49b4506b7a54e59ddb937668f9435bd3f0a43e5b10e4ec6ba64f23beda0eb974
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 18148 bytes
SHA-256: 0479789e2ce8701175c3f66e8f5673ffdf2b878bda1d31dde70300f847bb3cdc
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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