Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0ca71cc93632e6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f65abd4886d6183ede4268fe2e7d72a SHA-1: ee76c1be92f0be524c6f99add752f992c151820f SHA-256: dd0ca71cc93632e642ece09d50090924a6305a0f93f6b4cb3476006fddb1b4cd
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 as a phishing trojan. The heuristics indicate it functions as a link farm with many disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a high number of embedded URLs further supports this, pointing towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/kizejelofusulodo.pdf In PDF document text
    • http://keralatravelpath.com/uploads/file/17540304861.pdfIn PDF document text
    • https://windscrm.net/files/file/73753978416.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/sidajosadifebuletude.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/97074351539.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613140d869e2a---webafibu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/28659934952.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/feranuparip.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/niraduzuretenifaxonurekil.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/91315744225.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/fegelasuxovibasekilorab.pdfIn PDF document text
    • http://metabolit.ru/files/file/37997818865.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/d2cbbe076abcd7498b219738415de6fb/89132247585.pdfIn PDF document text
    • https://hobbypet.cz/files/file/suzojor.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/wajaxukoruwajip.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52541234361.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/binalirododel.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/mewowal.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/28375337078.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/negawuvulitetatetinijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=outlander+book+1+pdf+downloadPDF 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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 18132 bytes
SHA-256: 351da8aba39de913c5d18653500751e3a52e30374e9f8202d2f9ba7a95d6df6d
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 10728 bytes
SHA-256: 1f84a94282b80caac416ed2d1ce5ebbb69308255da842a0cb3ec97740602abfd

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