Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb675eec97c4b59…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 10:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97a3fa487774ff4059e1c6151528539b SHA-1: 3ca97d81b12135aac1458070c7e379d1f5ec23d2 SHA-256: 3bb675eec97c4b594cf3d8aded33aec187e99f0e65cfc3199edad3a2ad51928f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maymaygiaydachidang.com/upload/files/6564282321.pdf In PDF document text
    • http://promocode.lu/userfiles/files/kanumodavujatobewefas.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72407717050.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26431156216.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wazufuwufiladem.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/85508568754.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/79372326938.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/84815696429.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/mufedu.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jewiredowiwa.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/wekolakazolusitofojot.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/jezelexekutuborenobifilen.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02dcb47d0---vimosasipiwujoxav.pdfIn PDF document text
    • https://razredna-nastava.net/files/nuzajebivines.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/66110137744.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19670878047.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/72748937363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+file+transfer+not+recognizing+phonePDF 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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 17392 bytes
SHA-256: 0dde4478866c9afd3154058aa8def306ca8a9b58d22e0106bdeaa0478ffe4ab1
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 10940 bytes
SHA-256: fc47106c67efbf4eb4c41fb181dc1df37c2ac73b7e481deb10df372a4241b7bb
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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