Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1dd992138e1d57…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 11:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3c13913a9ec4883d5e11b2633c36fe7 SHA-1: 98b83596548f96dba6840cb9b1600a974971879d SHA-256: 7f1dd992138e1d571303c99ac6422b06e5ce6a5ad6a7205b01046b3bc0e75de5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=byron+cage+i+will+bless+the+lord PDF link annotation
    • http://yangpupark.com/uploadfile/files/karupewego.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/biwaf.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/435478363.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/teferodo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/zisomikodob.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jabadosiv.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/gifaker.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/xozotal.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/34757346852.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukapiwonikopajozimova.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/253387254.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902050554.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lagizasilajoto.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/wowurebaxula.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/sibabituz.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/20208874813.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/29781394529.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/98c86f15f39b691c558b4e1753592ad9/53374349937.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/bovilejazexilulavude.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/23036033049.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/rodopumosawiref.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/buviliwur.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vabepodamukos.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64a50a5f5---68988665999.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fezomefasibexolidageso.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kedorivegixejumodanawelan.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/20021348607.pdfIn PDF document text
    • 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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 11040 bytes
SHA-256: eb6500a861367603b088771fadbe99758d13d3e74e59fd80d2bf947e701117d9
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 16676 bytes
SHA-256: e7b41ebf5ad2b83ae82f68db4135ed47b868d540c1d9ebf4831cdfe95d5a8217
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1