Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79bb97b5a9ab5e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 03:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bfc995ee0bea75b1cd1cc4422c01d21 SHA-1: a445c41073b39234efd367e73198566312408bff SHA-256: da79bb97b5a9ab5e0e6273e742cb91d669e91ac84d771bc3c2db95edd4c7a5de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://prospr.fr/ckfinder/userfiles/files/15894945522.pdf In PDF document text
    • http://kcpsystem.com/userData/board/file/kutezabom.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/javugiro.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/62500514987.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/2483828586.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021961732302104.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/99221523229.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396b205315b---91030701665.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/tidiledapudixigumajawokov.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/99286144053.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/wugilotometuna.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/furikeleralose.pdfIn PDF document text
    • http://abwrva.com/uploads/files/71717636043.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/61822315877.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jejezot.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/vewofipiwuxaradobavevil.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/50976161465.pdfIn PDF document text
    • https://mihalex.by/files/files/gufoxezesabututipozusek.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/26540587973.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/dodopoxuzufowexad.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161388274a471f---28357688854.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/razafog.pdfIn PDF document text
    • http://recrute.fr/files/files/besolumivuzoxuvogenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=purble+place+for+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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 17284 bytes
SHA-256: 8a8651e484c9c737c1684724ed5bd9a9298ae448cfd559aca5308430a2518cdb
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10588 bytes
SHA-256: e30eee635f1860c5d778c12ea877385dcb2abd43dc6a0783721ef863ddd6c21a

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