Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe967e9b25d905d1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 18:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4f7c488c7d0149b478b779eeaf65754 SHA-1: d5077df203158b660631e130a522ab857495bc2f SHA-256: fe967e9b25d905d16f4af6b27c2873a0e769df3cea7061f25ae1a958d9921639
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=diskpart+add+drive+letter PDF link annotation
    • http://sanzmendia.com/userfiles/files/dijiwufuxumisazeneb.pdfIn PDF document text
    • http://yuha.be/_files/file/metusododi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/89416511428.pdfIn PDF document text
    • https://isleo.com/i_photos/file/69649628895.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/64049791405.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jafakokuvinobuvajedewa.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/50475638358.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/12097147064.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/55677869514.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/puvezuvexowux.pdfIn PDF document text
    • http://vhshf.de/File/sanuborowikut.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/46451754798.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bosakipuf.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/35369653999.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73112054098.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/30847162093.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/zipoginebipedelod.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/nanojada.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/ridodirelikuvogelefa.pdfIn PDF document text
    • http://yibetter.com/data/files/40535248540.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/mudulifofanixexen.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tagufanidusigejoz.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_off0000af8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 15976 bytes
SHA-256: c5d334cd2b5edc0e7f4e235d4bca68a9d4e040316047a7b6acd057c19a9d7c2f
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 10320 bytes
SHA-256: d34008378229723543efa8dd140fa28f19aeb89bcfdfe1fcca4e44e4d3d0a059
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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