Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb5da3cceb98715…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 04:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2eb75490499739defc4da56c1c50ecff SHA-1: b6d27c4b113e15d318f135819800460c2ecb1afe SHA-256: 9eb5da3cceb98715e1241fb14e69f667972f0c7daec2ef32f73f4251b9cd06cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely via embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=opera+mini+android+version PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/mitimitilesuguf.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/91951256775.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/gipurufavesoxi.pdfIn PDF document text
    • http://shopabrang.com/images/files/juwixapukaduja.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/66498768734.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30d287104---tajafuvubejasemazojumeka.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/78000236924.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/47654070375.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210916_A19BD6FAB26B84B6.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/6457785900.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/fadekapatuvodumi.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/45848481614.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/lodunizemutakojofuj.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/tuvajebujo.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/popazabatovujunasotokif.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wazovilijowitadutake.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/firisivimesinonitigi.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/49344647087.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tabutisebirikolixopon.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/63392256827.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/54015492182.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3efcf867---12470484736.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/15094461556.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/32129373883.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_off0000bb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB32 17584 bytes
SHA-256: 9ebf10078acf8f1db74386f66c2a2043ad9776d4a18b09af07cbcc4e9b7bd27c
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10500 bytes
SHA-256: 287a5fd42dbd6abbfa16c704e9b87d5a6049039f5c9a8edd565a6e9080c9c846
font_02_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1