Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8dd6154af51354…

MALICIOUS

PDF

95.7 KB Created: 2021-09-20 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb801b2b2d9d3e63a8cd751f4fcc6e98 SHA-1: c6105d8bb5914293a7e998657265de19137bff6c SHA-256: ab8dd6154af51354dc86e8f01ae21e1007c6a39ecfe11c1510b08a086ee25730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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 http://abimobiliare.pl/pliki/File/fetum.pdf In PDF document text
    • http://noithatlekhanh.com/Images_upload/files/39349902330.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vokereruw.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d926e69894---58150382730.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/davuguzejopa.pdfIn PDF document text
    • http://henca.com/files/details/file/63972336264.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/56124597320.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vonorasiwolababumefip.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/82409100897.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453644ace00---96298586794.pdfIn PDF document text
    • https://egf.tw/test2/images/file/nebababezozufanavarov.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/95983357584.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/tipodozifawopekup.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/50670149101.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/pudisakegatefukasujemuj.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/22872301054.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17880076334.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///71304618327.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/52227724302.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/3757596620.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/rusewesorewexo.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/3616826226.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/43135922975.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/23692037211.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gaxaxuxuwesiwigudelado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+followers+increase+free+onlinePDF link annotation
    • 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_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 10716 bytes
SHA-256: 995944093b59f8541df6587be1092f96122d8698e835309ad23d673ebe6f7874
font_01_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 18416 bytes
SHA-256: a3883b0ef447baf1abb944d785cabb542ce616132bcf320ba7a0c948a5effcd3
font_02_sfnt_off000158e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1