Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c82a1fc0617e53…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 09:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d23b85e702c5e8ac60c11f4ff10e860 SHA-1: ef2ae0c19176308c9e3ae300a082db9452f72713 SHA-256: 90c82a1fc0617e53cb9a096ea0a8b5108c928d03ad66a8ffbb6fad2a4b28c933
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being a link farm designed to obscure the true destination or distribute malicious content. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the structure suggests a potential for embedded JavaScript or other exploits to redirect users to malicious sites.

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 https://sfeerweter.nl/userfiles/files/9051936674.pdf In PDF document text
    • http://snuhonors.com/userfiles/file/51535107712.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210917221103.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145729e76a38---71919045927.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/15945276260.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/74273233442.pdfIn PDF document text
    • https://nls.vn/upload/files/20556065231.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/63501967513.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/88658608614.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gololiwavowi.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/25428294500.pdfIn PDF document text
    • https://invest.pl/userfiles/file/17873244203.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/lupopolumuz.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/82403891806.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/40886363691.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/71247102416.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce05cea0b---tisefizuveluwubujalewu.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/sugagere.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/30854597570.pdfIn PDF document text
    • http://hla.vn/upload/files/lijovodizaludewupufutil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+mobile+shops+in+sri+lankaPDF 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_off0000c1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 10800 bytes
SHA-256: ffed0dcc54b7af98833c87bbfefb89799c33e58cd3ec14d968a7a68c6f3e40cc
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 17880 bytes
SHA-256: d8e17c3b602abf401946c65d1e964418f145aa80bdabb9b89391f612b37ab042

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