Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776b3f245de6b96…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 17:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 194240e4fd52da21a0621f56f1a91326 SHA-1: 0b34edd76bb1410342ea0c7ff14e716aac981110 SHA-256: c776b3f245de6b9675424c4f73c749bcd0065a1c9152d7e6fbd18ac6bef2fe4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a structure designed to host many links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://industra.sk/userfiles/file/22713685205.pdf In PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/mirigagazatagedonave.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72562654419.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109071918413326.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc43b69c9a---netuvajotureriredekopo.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/masepiravevuxufenepaw.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kemajufopezovep.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/64746018735.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/70658892950.pdfIn PDF document text
    • http://net-work.cz/data/file/lijaxejofi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/94448308814.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/sisedisotaruvukonubasi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/11995975eea53a408ea0543d4042e920/pebodutujanumetasulokoda.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/maposekidupume.pdfIn PDF document text
    • http://groupkaishan.com/d/files/21167694734.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bifuwefesexesofazamom.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/72224269.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/61183925870.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bufodez.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fobifexagixu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/tijawe.pdfIn PDF document text
    • http://autodilygood.cz/files/file/xomapebujoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=saaho+telugu+full+moviePDF 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_off0000b8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E8 16636 bytes
SHA-256: 5c3bede5c400cef6bb494e27f1ee7806b5fb2828d002f78a62b295bce1cf52e1
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10528 bytes
SHA-256: 70f061f53cc0def21dd820c3a5dad1d50a346208de6b5e95be0be8427d5dde5a
font_02_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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