Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f5ea314f31eb53…

MALICIOUS

PDF

99.7 KB Created: 2021-09-21 23:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cebc16f2eae2ac2edb953770d8313bf4 SHA-1: 5df08d2b70250b2c86fb74a21f47223ce2bc6f4d SHA-256: 91f5ea314f31eb532065d17ff285a2e67782488f4a8c9aec7954ce451590ce50
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pixomot.ru/uplcv?utm_term=pokemon+light+platinum+dusk+stone+cheat PDF link annotation
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/83625395880.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/13309210856.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/laxuv.pdfIn PDF document text
    • http://calisnt.com/uploads/files/vumewiroselixazidavoga.pdfIn PDF document text
    • http://land89.com/ckupload/files/27598019076.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/zafufazanizebumenijomoda.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/53275654883.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2c7af9d5e5ae9ce80a830a3ae98a2b45/63160313740.pdfIn PDF document text
    • http://all-premium.com/user_file/files/wapokumi.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/96792540289.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a83f54d286.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/76860357096.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/sobonesibixagutar.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/58320197772.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/telaje.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55813205690.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/67380903970.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/burunidolifabanizuvu.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/61910474837.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/63108095189.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/mulazagimejege.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wegusefosi.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/pojopaxukifiburono.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_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 11052 bytes
SHA-256: 6a305bae4ede6cac49e37fefdb9ebfe108c64f630fa27dea9d2ac20e6b480ae3
font_02_sfnt_off000151bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BF 18548 bytes
SHA-256: 2c7cc711e5aba6bd3f803df57aa20fbbbae406a9ac508dcca910049eb2dfff8f

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