Malicious PDF — malware analysis report

Static analysis result for SHA-256 25968e32c6c3d19d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 00:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3715dba0dbf27e43ab710e638428d6dc SHA-1: 1cde2a2cf79eaa06d7e77dd63cd61d1b80ab5507 SHA-256: 25968e32c6c3d19d3e8ec5d4b9ab0cf574a3d179a1f9cadaceadffe6b15387fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, designed to redirect users to multiple external sites. The embedded URLs, despite some being marked as benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.potravinyav21.cz/ckfinder/userfiles/files/8492847172.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4ca0264bc327e7b51181e806ca1e3b41/sivololezaxu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xedilisisafikukorepit.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/pimumoz.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vidov.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gesavajubila.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/wowojuxuboxemizo.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/57513016403.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc440f99b---41755979435.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mojakatepejokijaj.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/juwijajizevimi.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/3541313282.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/mixutexonujilolu.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/lerotubejoxujesina.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/38314110268.pdfIn PDF document text
    • http://getvisa.ru/images/File/57900010187.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/454823231.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fojevis.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/37314456374.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/70120829674.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/1848614164.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/98739025400.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210921_2E887DD0D475F7DB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=filelinked+android+tvPDF 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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 10208 bytes
SHA-256: 3fe5904bfc74f9a22a4e860828461b5663e9b0440d2698aa1144baf9ceebd73b
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 19340 bytes
SHA-256: a7fa29562e9d588d4479df1486037bf63eb574b4982f7669cefbc05fbab295b0
font_02_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1