Malicious PDF — malware analysis report

Static analysis result for SHA-256 953f03193f46c706…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 19:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 615660f1b344cb75932d8a4cb1ec374d SHA-1: ba25bf5aec9268340730e39beaa37469b4208908 SHA-256: 953f03193f46c706a5248d7d9ac4ea28ade986db391794d323fe0d3f05440dd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF acts as a link farm on potentially untrusted hosting. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=wallpaper+minion+hd+for+android PDF link annotation
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_230807.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/15798369822.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mojulinum.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/muzemukogedutisuvukozino.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/83422758385.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/49947829909.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/46576976670.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b5ba7a4d---59661247281.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/64776089314.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/79195709760.pdfIn PDF document text
    • http://orthodoxnews.us/file/35056579710.pdfIn PDF document text
    • http://chinalabware.es/d/files/19335713532.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jamusepelenejepe.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/gezoperobu.pdfIn PDF document text
    • http://prmakeup.com/Image/files/porexivifixoref.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tuzalir.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27267999470.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/50929432112.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/45014681302.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/tinejopigemik.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/4616985835.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161408e10e71af---fegemeloderaxirufatulug.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/19865810607.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10488 bytes
SHA-256: 82502f3c67c4776ee65e02cf62ceb87e1a0581a0c12c90526f1f2e82577b58be
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 19196 bytes
SHA-256: e2ac1382c83bb81c5e2a567a0dd948f1c4754c199f9dbd8df5afe45ea8545964