Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d14fa8df249020…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 09:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bdb97dc9db042370c0415f3e82eacae SHA-1: 1a43a8f89f6d35de2478d386cee5ff6469e0202d SHA-256: 43d14fa8df2490203bf6995904620ba4e9a32e5d067f51403f1593159bf436f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a large number of external links, many pointing to distinct hosts, suggesting a link farm or SEO abuse. The embedded URLs are likely part of this distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/121941477605.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/bevotixezerakokuzuniroluk.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60095728294.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e34a97bde59553d92edec286b6f42f2/22640581263.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/kefemiturutomeso.pdfIn PDF document text
    • https://patc.fr/imagesfile/sitikukexoz.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/45444460537.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/98767417074.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901062149930886.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/moladafisudikawigulut.pdfIn PDF document text
    • http://getdol.com/page_data/file/lexemixitupa.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904003015.pdfIn PDF document text
    • http://foxadv.net/file/13253613041.pdfIn PDF document text
    • http://adice-area.com/pictures/files/47626008287.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/witudivuji.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071026198103.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v2sgmek35bi5fohjv0cbm4nnu5/89550617220.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/dazusipitefit.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/19961278756.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/gukofepazenofotag.pdfIn PDF document text
    • http://strahyi.ru/images/file/48854355956.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/butuzotipawagevesezojona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jurassic+world+streamPDF 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_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 17528 bytes
SHA-256: 15caf35286abdc2d46ea4e86a64d4de2a2313f1abfb7b06ec12d55cc9c862c5c
font_02_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10604 bytes
SHA-256: 4a49d1eb4efa4daa89ab4cec6c663be322503fc046406525a3b16f8e7326e4b2