Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ed4d5e64e6c46…

MALICIOUS

PDF

159.7 KB Created: 2021-09-16 02:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 812ffecc5f8c8ee1e74d7ecc8322eb3c SHA-1: 5da131b8abfe3abef7c569167bae2e2551b665fa SHA-256: 958ed4d5e64e6c46c50316fe77aec927d3ca48e58d4352dfed82dd6ff7de07bc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and the presence of embedded JavaScript strongly indicate malicious intent. The embedded JavaScript likely executes to redirect the user to one of the numerous external URLs found within the document, which are often used for phishing or to download further malicious content. The PDF also exhibits characteristics of a link farm, further supporting its use in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.2452

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.
  • 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
  • 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://crysiq.ru/uplcv?utm_term=historia+universal+1+santillana+pdf PDF link annotation
    • http://glassick.com/userfiles/file/vuzuzetozateniluvone.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ligusotufisa.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/kifunalojobojokemovag.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/48243301030.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/pufimixij.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/zerakewusoxox.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/fawusumenijexidozofusaweb.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090115490073499.pdfIn PDF document text
    • http://119pump.net/d/files/32520425763.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/89663692780.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/gojekevujiruleduzasaf.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/55118769329.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wugukuvinewumalepamel.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/durinolafoledijadiluguwe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f40b0304---vazidam.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/20858093301.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/95224191825.pdfIn PDF document text
    • http://chieucoingason.vn/files/29241487676.pdfIn PDF document text
    • http://dsagco.com/Upload/file/rumawebinopudiwinezimelor.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/28552415894.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/rigukirimijemilab.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xizef.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/37895512511.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/gofawajituviti.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/27566295783.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22648 21988 bytes
SHA-256: 29faa01beff8d890457cdd9e2d50831cf12803f9f83e5641f208af9a6db9cff9
font_01_sfnt_off00025e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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