Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf52a03b06d9b37d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 15:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 48dfc8a409089ac1f164d49e4b8d083c SHA-1: c6609a7d200383d49cd022a48b0235e83e6f2c31 SHA-256: bf52a03b06d9b37dcd16f58a30eca33fcb4a03df8b554d714d139421f13aa3f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://spalovnachemolak.sk/userfiles/file/pitexixewoso.pdf In PDF document text
    • http://rjbmachinery.com/d/files/43506568769.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/zoxov.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/79525361197.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/43613891369.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/52573012206.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/37204191514.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/47899804108.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f4d8e7f6---mekafoxo.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/20272045460.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210927061619.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/pebakixawepox.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/kesilabekijuperik.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/janonoroko.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vikulevekuko.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/puwirejibagixebij.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/tutitemisavafipukubonafi.pdfIn PDF document text
    • http://szcftz.com/upload/regufupalizosexurepise.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/78234054773.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f034633e54---27041198281.pdfIn PDF document text
    • http://rrarental.org/upload/file/64119982761.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/76601615311.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/95990547692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+sa+apk+mali+downloadPDF 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_off0000aeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB3 10536 bytes
SHA-256: 5400ddd2510282fd1b3a5dfbf4c5095fe11d8ca6a837bed6f9fc44b9f5cb7085
font_01_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 15392 bytes
SHA-256: 57cbc6274fdda3642b137325d85f563bc8f017e3bea34342ac7855a6ea37cb92
font_02_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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