Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0f75ddbcb7ce2c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 11:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e489c62f41786bb2689bd9089740119 SHA-1: 56333b2877692ee1ce3f339c5133ae16e42126c4 SHA-256: 6c0f75ddbcb7ce2cfe8ef145c5bb186c8e913cfed452efbea3b482190a7ce858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm hosted on disposable domains, with numerous links pointing to other PDF files. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://fabrikando.com/cmsimple/images/file/38861308137.pdf In PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/naxobamefoborado.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/82446094373.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/muwijitafejilatuwiri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429d79a7d9d---61359709548.pdfIn PDF document text
    • https://kapefashion.com/files/files/mawatufozaxiwapawi.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/radakajugagepa.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/jarolisafofiz.pdfIn PDF document text
    • http://shahgrp.com/uploads/47230897591.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/xezafuruwadejugawun.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/pipokedomarufupasewusene.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/93429646783.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nowep.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1a9227b12dce8d41932b91cef2faab5c/kozaxexi.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wumasorupaxoraz.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219141656467555.pdfIn PDF document text
    • http://philboyd.com/39389288932.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/37832170644.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/nudowusumodenejevu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xoweveko.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jugezodarevevujuvojume.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nilekelizemipud.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/litumuwirejufol.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/95659847632.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xifagewasafudemikopejav.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gelowitavusut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+5+games+under+100mbPDF 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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 17440 bytes
SHA-256: 24339e193ff6315828dd103ced12467632fd9b7af9916fe4bae9adc7fe445a13
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 11012 bytes
SHA-256: 2be06e78d2b5a18701ef26b2f67cd8124ce53331973e056c0e553a1b1ced5b36