Malicious PDF — malware analysis report

Static analysis result for SHA-256 323194ea71bc2363…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 20:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 976727cb13746faaa78dc43c48644d18 SHA-1: 5d82b4854001860a972a080dfa9fc55b4bfff2b5 SHA-256: 323194ea71bc2363f28f59eb460aa617afe3ed0cc440a93846f3ae228fde1971
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=robominer+free+robux PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492ba8df919---varufakosasiwesiwimuli.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/gofeb.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210922070143039065ex18zp.pdfIn PDF document text
    • http://parateam.cz/file/zabakugoboneromukute.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/94428898223.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/38362998618.pdfIn PDF document text
    • http://vhz.cz/user-files/mijagabeziluz.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/54069162396.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gajafibarike.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/fetixixivivovedi.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/77062138377.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/wefasewosemuwif.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/juburunalefokisunijuxelu.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109071623453979.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce85969e9---54933998665.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/89853004935.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/85419748105.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/92621958818.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/81215681507.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/dadelizatawa.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/zamasapeja.pdfIn PDF document text
    • http://nova-auto.com/upload/wikebozajulo.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/gegeno.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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 17316 bytes
SHA-256: 35c918136865075cec317c0732324712651a368598542fb58f465e81e7d39e66
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10288 bytes
SHA-256: f5d4b6b4a0a9d91c1ae65b1cb70e5f27cde4224e4dd1c2a191e3f5c77cf3eaa8
font_02_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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