Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0ab96cb325bc9b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eca0e4231c3c0ebe511bdbe7c834f9ad SHA-1: 4ea0389d6a6fc9ed621a30483031a44385ed7ca8 SHA-256: ef0ab96cb325bc9b984e6857f996c55da7419d0e1e31d38d5401d45a9c8694b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links pointing to other PDF files, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seerupit.dk/assens/file/sesesifitipupafijes.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/vadobojelurugiti.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gujunadowozu.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/lapipamimajoku.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a8699ada---72228012457.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vonijusodemoxeze.pdfIn PDF document text
    • https://businesslife.com/content/file/70584161874.pdfIn PDF document text
    • https://cmf8.ir/data/file/59091601157.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/veragolazixikarunu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/27727100169.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xovor.pdfIn PDF document text
    • http://attlas.center/userfiles/file/84658132350.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/4457245723.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/59603356082.pdfIn PDF document text
    • https://network-italia.it/file/28518604692.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/4315079999.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/50162732432.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3ra9p5lufn6csga7c1344alpqb/bokozer.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/kifuninidebiwivodolozanul.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/telorupirurukiveno.pdfIn PDF document text
    • http://tid.vn/upload/files/61712199643.pdfIn PDF document text
    • http://mamitobe.ru/files/file/ditifareroviwelarigowano.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/70766029452.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/nujaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tom+apostol+mathematical+analysis+solution+manual+pdfPDF 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_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 10960 bytes
SHA-256: c4dbfe615c1257cf03c113d1de39c9acae18f033013b0b85773922f07cdaa585
font_01_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16800 bytes
SHA-256: 9c1180ef3f3b62cc7df70627aaf3054600fa1549e3e56cf6b5be84a7fa99735b
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1