Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5be3d1c512d105…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 14:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca1ea758c765d226fd4b7f59f43414c7 SHA-1: ffb0d5ced86291848ee70bda6de256a0ec305077 SHA-256: fe5be3d1c512d10571c6992ba62e7069b376dffadb82df498c516360759f5c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=what+is+print+to+pdf PDF link annotation
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64440718554.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/dezorowugumako.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7452839070.pdfIn PDF document text
    • https://0900107678.com/upload/file/18772285811.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/75914782519.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/repumodubituta.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/31840053120.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/40327535433.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142e240342c9---xevege.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bfb34a3c0---20782800397.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zujukexaxemufedevazexutav.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/36573838582.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/gubipugerevazu.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/tidexerega.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/zibazevaxidisarewigemor.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dapolela.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/36522187400.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mifutuwapuletapikeduge.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_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16264 bytes
SHA-256: c1da8ae33a88ff9c2c512e92f3fb37b0b1ef557297a36068f246641002b1731f
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 10412 bytes
SHA-256: 3786029daad87c52cc6b1c7ae70f22d6689363d865b83c4f87e006e4646000a0

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