Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b43868a74d4c859…

MALICIOUS

PDF

73.2 KB Created: 2021-09-14 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e661cd1cd039d820cdfb518212d3686f SHA-1: ba7cd41c32db6fa455ca4db6703344713a5a70fb SHA-256: 2b43868a74d4c8590e6a756d7366ff3b19154855f474ac22b8f42ca595e00f60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ctm.it/userfiles/file/99083426322.pdf In PDF document text
    • http://www.andreapondika.cz/file/16362972144.pdfIn PDF document text
    • http://vucert.vn/uploads/files/bomozirawatoponujimuvo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kekuxukuwezopopitarug.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/duvijapi.pdfIn PDF document text
    • https://diphong.com/uploads/dugapa.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/48459156538.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/90306970625.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/99805851572.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_07_18_59_36_3706.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/1191620641.pdfIn PDF document text
    • https://manenshop.com/upload/files/96857583569.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05615a467---48322208210.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/37242947100.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61320b2379eb4.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/12407459070.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/jizutoriniwaxew.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/muxinanizugojajuse.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/suwuto.pdfIn PDF document text
    • http://nenorm.com/files/files/tenuretejosatova.pdfIn PDF document text
    • https://windscrm.net/files/file/vozojar.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/kojaduretegunig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=serial+number+for+autocad+2019PDF 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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 11244 bytes
SHA-256: ba06fe1199e838e621b2fada28103985b3532343ec3dc5996fa4200d12c9a55d
font_02_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 17872 bytes
SHA-256: f6db5da610a6d2626930cadeaeae011b74a0bde3ade9621d69d730fb6515636d

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