Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0943e80753aebc4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 18:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4ceae27b55e71e66c08c6656b3254c6 SHA-1: 1cebfb4b9f2748322a80a2ef5ecc283be76768db SHA-256: c0943e80753aebc4fd71e6d8c9088f1c848a1454cb608057dee729683df5409b
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous embedded URLs, many of which point to other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.studiorosaliabusco.it/ckfinder/userfiles/files/mupur.pdf In PDF document text
    • http://www.gdchgs.com/admin/img/files/96584275367.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/tekemabama.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fifugejazu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goverolobeba.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eavve0c3r9oacibvrarg92pfj8/sosetogufaxojesumeli.pdfIn PDF document text
    • http://17njl.com/userfiles/files/musonara.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/kurenakitoz.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/36703649320.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/madulugazenij.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/27fe771a73560a4c50873f91a3093366/92299185740.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/zimudupadibeduragelopina.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/labikafuvojab.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/17938554781.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/nupuruxaz.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/17158461632.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/83070400798.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/54924562633.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/29271170740.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/jirazokizuzomepof.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/24029994239.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/90727336155.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/65278408738.pdfIn PDF document text
    • http://praguetransfer.com/files/file/98181960516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+password+recovery+toolPDF 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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 10684 bytes
SHA-256: 5c0d19ea9db7f9d880dcdda05f17f84e95e642d045f5621d32b3b164878f7a6e
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 17000 bytes
SHA-256: b0af6fc104ff6afccc3795a67c343737dedd74ddc88a01b4cdd3518747fe45af
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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