Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d6e23d81315461…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 21:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ad783d15fa8f20eaa24ff0f799827d4 SHA-1: a9ed2ffd6f5f5ca19949f57d0ff2e7b5923ff252 SHA-256: 97d6e23d81315461142b9235ba6a3083ebe79e0dbf9e1a4e95ea50ed78f01e75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, a common technique for executing malicious actions within PDFs. The PDF also acts as a link farm, pointing to numerous external URLs, some of which are hosted on disposable domains, suggesting a phishing or credential harvesting attempt. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://corporatiegids.nl/uploads/files/1426928618.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f819889cdc---19394446672.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zijafiwokatetepa.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/27583866770.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/jivowejegeleto.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/fiboxikoxosomoxar.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/5831100086141c13c43a14.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/fibofe.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/85885815820.pdfIn PDF document text
    • http://www.og2c.com/images/file/97453508213.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/mukisogevejaja.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/93498485283.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916064839.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41885338746.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/85787667634.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/90713753507.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/22042992940.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/44118844482.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/donoromifedono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dnd+character+creator+all+contentPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 18004 bytes
SHA-256: 0ac4529337767a7f1da933e73fcd80ec9aa84b133594d4eb8f3cd540dc5f43f3
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 10208 bytes
SHA-256: c06ccf7e04804f82b005e3080c03bebc51bfaf643eb0afc3c7864caab56c9522

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