Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb021870d1065704…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 03:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 641cca9fca15f8e0d9da9a985cf2a449 SHA-1: b1facc744fe6f6976e6731aa0768dffc4a040f14 SHA-256: cb021870d1065704b5e99c017501178a6552b940aef2f0d44f3f53f445a2e30d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to a large number of distinct hosts, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://viacaosaopedro.com/www/js/ckfinder/userfiles/files/51115169218.pdf
    • https://hrmconsulting.biz/upload/files/maxepaguvinojalaroze.pdf
    • https://nergizleryapi.com/image/files/28967680525.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316049c9f2c---vudijefawedumineselitewiz.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/tiwegoguliliveduzokamikon.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/omvsibp4v858qps1sp91635tb1/39703333380.pdf
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905025725886275.pdf
    • https://insp.biz/img/file/11980548408.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/lujezaza.pdf
    • http://lor-rostov.su/userfiles/files/vujebuzonirewala.pdf
    • http://lidaoxc.com/upload/files/danibisijawivimanoz.pdf
    • http://esipro.be/userfiles/file/mijosupak.pdf
    • http://huucodatlanh.com/userfiles/file/99836234498.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/8863423861.pdf
    • https://es21sys.com/userfiles/file/vowarolagukagazad.pdf
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/pimoxow.pdf
    • https://oasis-travel.ro/files/29644439099.pdf
    • http://mama-care.com/UserFiles/file/32311562452.pdf
    • https://nulifeus.com/~nulife/userfiles/file/40530071014.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+turn+on+predictive+text+on+my+android
    • 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_off0000ced4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 16792 bytes
font_01_sfnt_off0000e6e6.bin
a8c475967be28479b77d49252d9fc32a69dd0ce9d61cc14236ea33f491954cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 17648 bytes
font_02_sfnt_off00011483.bin
14c414c8c3a89c543b012f1f06904b5b5e52886594b53d709e1cb06340213d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 10920 bytes

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