Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70c7e9647e58c63…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 15:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0617e98d74c5a509de98313684f059c SHA-1: a641ab825d9f5a734a2fd89b0dae121f878af2b9 SHA-256: f70c7e9647e58c635446485986431d6ab368461dc5673c2c57d1e3f4bef45c81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to disposable domains, which is characteristic of phishing or link farm abuse. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ukmalayalamnews.com/userfiles/file/tuwojilef.pdf In PDF document text
    • http://lactopad.com/uploads/files/lidulisugab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304d31861d7---87033505483.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/36639267244.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/betaxaxafutopit.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb3f3f6c8---41088094921.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/49000892250.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/moxudap.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/855676269.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/torogi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4910311061445295083f0.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/21069681738.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39465609460.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/gajusurujinipavu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/zudanosefegodowiguze.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/dodewofol.pdfIn PDF document text
    • http://www.siposferenc.hu/html/ruvupawoluvusakowubob.pdfIn PDF document text
    • http://3m18.com/images/editor/files/polowobogipigavovixuvir.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fedolipojikanirofeboto.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zezolimobokob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=all+downloader+vidmatePDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10372 bytes
SHA-256: 0bb7eafecda511b5191adef664488fc724f10cac70e22f5faacbe46bd8587d58
font_02_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 17172 bytes
SHA-256: 1b7ce50cf94939a2ba170f52a22f64a3e5659de482f9cc26795afbdafe7778bb

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