Malicious PDF — malware analysis report

Static analysis result for SHA-256 c089da4b50dba4a7…

MALICIOUS

PDF

62.5 KB Created: 2021-10-09 06:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9998c44587731f4828bb3e70b7125ef0 SHA-1: ac74b03d3f4ad1d4c815d2eda0a0ac1f1411efe1 SHA-256: c089da4b50dba4a77b86c6c4909c88c640d38c16e5ebd8e71207c73f981ec4a4
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous distinct hosts and disposable domains, suggesting an attempt to obscure the ultimate destination of the redirects. The ML classifier also flagged this PDF as malicious, increasing confidence in its threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

Heuristics 4

  • 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
  • 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://le-lemniscus-incandescent.fr/ckeditor/upload/files/41752186060.pdf In PDF document text
    • https://lecachet.fr/docs/files/titevifemometu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9tl4k2b7l8m41f8nkgqfam6l6i/31663327700.pdfIn PDF document text
    • http://novichiha.ru/pic/file/65430268387.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fasexenoti.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/77906634901.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/moluguzuzewibonimifa.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88921415699.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/45850315823.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wuwizet.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/rojaxopasajaxifanugevivo.pdfIn PDF document text
    • https://izometal.net/mm/file/bowaxowatefava.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/43495842194.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/rojif.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/vujisefe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158b20ddfc4a---86413009511.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///41698901478.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/xevutexafuvabulojemome.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41641516935.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/nexinatijikig.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/mefimejifaji.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/daxadosibopaxaneminukovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=push+and+pop+in+stack+c%2B%2BPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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