Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce80ed8e4a09bef…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 17:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c9a0a1e6cba1333cebce09daf7519fa0 SHA-1: 0309b3620af8e8855f18cd8458383fe551d55270 SHA-256: 6ce80ed8e4a09bef2f3ed52968de9b2b84753261d633b71dd515c8a7ab4ed4d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to PDF files hosted on disposable domains, indicating a link farm or redirection strategy. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is used to distribute traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/kutanewewepagoxajafe.pdf In PDF document text
    • http://velomagazin.hu/UserFiles/file/25835784520.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/65224709206.pdfIn PDF document text
    • http://shahgrp.com/uploads/10532187853.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb843cef97---465121309.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ziruzajag.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/30236660818.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/8473934212.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/44140402014.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/304218959.pdfIn PDF document text
    • http://4rrecycle.com/files/file/59288503102.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/84435082817.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ae232849c56c9b9202fc8b7921b63fe3/dikupulesedewedek.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/fowirabudeboxugozud.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61461db9315d7.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/39022007937.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/83028983245.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/64219533927.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/kujepotakoxitokidufes.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wobatuzurejinunir.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/77765221880.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/33586115.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/mixaguxadege.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/bevixudobes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ff+dimensions+2+apkPDF 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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10604 bytes
SHA-256: 99e17e68e529900441ed47486991f6e5bbb8e6adcdebe243ad2577025eaac8e9
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 18236 bytes
SHA-256: 24a1e29a5bc13f6f7e0e267fe02a137fabf5ddc17c3fe60d0cd6d9be66fbf979