Malicious PDF — malware analysis report

Static analysis result for SHA-256 9354ba7e29676477…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 18:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 86ef38bd0676d8d967f108e860a0f381 SHA-1: 5cd66c6a42bd25405f025a3456f3339ba9f6c677 SHA-256: 9354ba7e296764770dc85d856d6b6e84ee7fa52d8c49a5f41f6ee0f0d54bf0f2
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 or trojan variant. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to distribute links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=how+to+retrieve+android+messages PDF link annotation
    • http://esipro.lu/userfiles/file/bosaze.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/57a7a3d67198d50ae404359ca8b48a33/vabagu.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/mirugisinijawuxabesemewev.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/lalaraxuzabatinugu.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109211307401531.pdfIn PDF document text
    • http://mweb.cz/images/file/86204441161.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-24/images/files/76765012884.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/tatem.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/49601954663.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/61103983708.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wojivadupobugifurox.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/surarijadijivetiro.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/fiwefi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2bf569c7---rugiw.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/xanifofelolumiwusapag.pdfIn PDF document text
    • https://satesayap.com/contents/files/82158035484.pdfIn PDF document text
    • http://viettruss.com/upload/file/rijula.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/tebit.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/dunineb.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/50313918038.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903071737.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/68796162442.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rezorupimekotozo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipid.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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 10688 bytes
SHA-256: e26d550812d9c6425effda307dc65f0311a23f5bdf9f8b328f33ab3fb9aded7b
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 19052 bytes
SHA-256: ad0256b613e7c703ed6fd78c0f852382bf6fbce0a62619506a375185ec150427

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