Malicious PDF — malware analysis report

Static analysis result for SHA-256 a238709530ee9e0e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-25 16:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1b7c5b74a609afa9a0c19ddf0aad82e SHA-1: 81387327d5501b9f4be12a9313173dcc464704b8 SHA-256: a238709530ee9e0e4e90b6318c82de7b5d13fe0b361e9ce091150eb1064873be
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references multiple external URLs, including one hosted on a disposable domain, suggesting a link farm or redirection mechanism for delivering a secondary payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://smidgel.ru/uplcv?utm_term=invalid+keystore+format+android+studio PDF link annotation
    • http://hanilkwanla.com/uploads/files/wuzirilok.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/86369255862.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81467057801.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/jojevuw.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/xalefizuledunadinavol.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/74330176533.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/66139721849.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sulefolevepi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bf1d140fe19d6464ba8b782165dedbfb/36124156052.pdfIn PDF document text
    • http://axwelindia.com/uploads/kogegav.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/bowidesebaw.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/32744676886.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/83487799656.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o4fqimlb62err0cs80pgutpj47/20512605272.pdfIn PDF document text
    • https://dalba.net/other_files/File/duziwetavoje.pdfIn PDF document text
    • http://iucecb.com/files/file/1408907440.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/45269119535.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/59101433061.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/18837368716.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nisozel.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bapinolerelitujimo.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/63043978329.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/3786990566.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/ririvakawabenojetawiwezoz.pdfIn PDF document text
    • http://lagrupacio.cat/file/gozilomifipiwuvoku.pdfIn PDF document text
    • http://gysanya.com/upload/file/210917161039175617t2oew4az49w5.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/61603122651.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_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 20156 bytes
SHA-256: 78167c892409df401c45ef5242900b55e2c1b74fe589b055880a2270e60544ce
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10836 bytes
SHA-256: a9b8e6925ff62391ebc65cece4d9bb1b7d57bc6f18f90cc0301fc13865085f54
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1