Malicious PDF — malware analysis report

Static analysis result for SHA-256 9441f71bf516adf1…

MALICIOUS

PDF

67.7 KB Created: 2021-09-29 00:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 477799d2badbdd4b3b7148ea3ed4f2c2 SHA-1: 01c99899b8c64a814610ed1479c4664cab5a3c66 SHA-256: 9441f71bf516adf16f35041b0d7f0aacbaae64d1a14ec17e6bc03206aa56bcac
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting a phishing or malware distribution attempt.

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 https://duocvinhkim.com/userfiles/file/92658113547.pdf In PDF document text
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/91752725917.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463e512a3e8---buwigugesotadix.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75198100842.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/1561428657.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/6866393453.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/51368353878.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/19920411006.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109141905039070.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/50521004647.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/nowusexusekiwilepoluwe.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lubozirominorer.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/jomobapejeme.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/85796113651.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/57655115068.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/78622761734.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xigame.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/nidujiximilikowuzi.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/mewewasexafetobolalavur.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/senovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=usb+webcam+app+for+android+tvPDF 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_off0000a97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97D 15384 bytes
SHA-256: 69efe1473ca7761145429b502177531359507c27c7fdbcb0998c8e66597f4f50
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 11032 bytes
SHA-256: cb71a3fa37ba3c52abd4ded24d26eeedd8dfaf4f174c3485863bae4ca1c40abc

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