Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72c568ab799ea06…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 08:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 398820dc35f45fe34e68fe419b04491b SHA-1: 7907b098f125868d60e91e1a93e68b23d567c8be SHA-256: e72c568ab799ea0617b935dc49f7549b2daf00b625893fb935ebb5ef95fb8a11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers also indicated maliciousness. It contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://cosyromania.com/media/file/kebivubusiwujujej.pdf In PDF document text
    • http://35ct1.com/images/ckImageFiles/files/buwaboxefawajidu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rabekadazakuxike.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/16626537136.pdfIn PDF document text
    • https://costarica4d.com/contents/files/vikiwezuxilubumokuvajerij.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/favixik.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/darivojubedetopoz.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/53424123307.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nogunapewudoguxuv.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/50852848395.pdfIn PDF document text
    • http://recviem.ru/img/upload/lanoja.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xolelojejuxuwasew.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kovuboxodororax.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/33211320244.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/98144267323.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/88974057255.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16151ba2cac0f9---20140289229.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/14973488146.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/37904283484.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fd108de4263db824005e1d127a6d5873/lexupaperakosiwidi.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/vogobesakokog.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/60847105920.pdfIn PDF document text
    • http://mq-water.net/upload/jeluberorukibakunebafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+post+a+youtube+video+on+instagram+androidPDF 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_off0000aea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA0 15636 bytes
SHA-256: 490d84492b460a12026a6f88a35e79c93a5d5d6beafaa765c6ba3db73293c23e
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 11188 bytes
SHA-256: 4d08a6af16e38431b5c002d15e4457e1860e3f0e42015fdf3b61bb811a2e7853
font_02_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1