Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15521a2bcbb31fa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 00:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9ef378b53b9d37b21cd6c7cc6d91f70 SHA-1: 5b682790763b569902a5887b4d6980bf27d68509 SHA-256: a15521a2bcbb31fa4674517388cd8fb87123f48062e8154f328858b8e68c3fa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to other PDF files hosted on potentially disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic confirms this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://jjsgreatescape.com/uploaded_files/userfiles/files/begatijuloxe.pdf In PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/67383891581.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8d8ceb7b40c41404607588102aa6fc0c/savijisebo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/vubezitixuvabunilajute.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/51295215105.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/miwobudaxuwuveduboburif.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/visifuwijimawi.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/soxobiten.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61773266545.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fegivusowafet.pdfIn PDF document text
    • https://everestart.com/images/stories/file/raluvevoxu.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fubavi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gigutulupisox.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/45666506390.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8ba1698d9c7a9877fd852c5d2c9b5804/99540961888.pdfIn PDF document text
    • https://cncunse.com/d/files/1101686186.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/12498540685.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/72670098551.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86717347210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+android+addonsPDF 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_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 10416 bytes
SHA-256: 7ab9086d024fb5fa931684b4547d9ac257c4b3f0bb91f4cc1f5926a3d8336086
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 18440 bytes
SHA-256: 4ae98614f9fd1d07a87b11bcd0bc670628e3b7b36efe91b150dbc5af0eb315be
font_02_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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