Malicious PDF — malware analysis report

Static analysis result for SHA-256 987c5c69073687c8…

MALICIOUS

PDF

72.3 KB Created: 2021-11-12 08:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a366f751f8341e76073bffd23b952441 SHA-1: e10f7be28cb30a91a3254a3887b510a510acd32b SHA-256: 987c5c69073687c8d70d48069fc80a970da6e4250edbc314734bce7b5cb4e7f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution lure. Although no executable scripts were found, the structure and numerous links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hyundai-dongdo.vn/images/files/dilofinebenikexojas.pdf In PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1634813378.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/kidiros.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/defoxosowuzumubepudolurum.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/kezetivebipemewibale.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021100111055497.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/rufoxafazu.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/nodifimofezopojotekivub.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/latilefuwaxusobejetogonir.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/luwufipusuwelibu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/watagadamumalekimugogidas.pdfIn PDF document text
    • https://isosklo.cz/uploads/xasopinumiwekesegij.pdfIn PDF document text
    • http://erictex.com/ufiles/files/20428345711.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618dc07b47950---fapipez.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/72752743467.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/46035348474.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/zorizexabadizet.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/tenukavomakifo.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tokixomelixufumalu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/65917968400.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/tizalanuj.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=of+bed+bugsPDF 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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 10072 bytes
SHA-256: 33332ea1a8e0d71b9e900fd9cacb94c83b82f7527803eda8acc456f51ce52511
font_01_sfnt_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 17612 bytes
SHA-256: d954aa971792c85343d2d410d33af1380f6f140daf5e8cb8e5f8ceaa0736f4f9
font_02_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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