Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4987a2162701d8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 13:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9eb499419063daf3d8e8d052ed192036 SHA-1: 4362f917884eb155e173e872e6935a0f64240181 SHA-256: 7f4987a2162701d82a8e491a75dd1f05db2d1f64b8f00dcd03d6e612e1b0f2b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://coretry.ru/uplcv?utm_term=hay+day+2020+hack PDF link annotation
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/nagude.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc244a8ad8---12183801039.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/nuxefinuki.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/46666981541.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630951211126779284.pdfIn PDF document text
    • http://kammed.com/userfiles/file/finokotixer.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/fedadiw.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bazufaxufiruvuxen.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/33630463506.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/75374470478.pdfIn PDF document text
    • http://deltools.com/userfiles/file/73949157421.pdfIn PDF document text
    • http://sung1.com/upload/files/vifesadorosovanuketodi.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/17436498699.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/4438718072.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/zexiwinuzix.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kelutasefozasiguzupab.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/zewadaletewuvitupejovem.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/fofaronafozomumegojoni.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rixixurifixug.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/1876251269.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/toguvi.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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 10044 bytes
SHA-256: 2ad25e1c6cca55367bbff88e8b8b97dc7ba1ecb166929dae37afc34c0be7e8f9
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 18480 bytes
SHA-256: 54d66d380fa46f22376705bf9fc1048a4750e543f33a9c87ab43f0062ad3c900
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.