Malicious PDF — malware analysis report

Static analysis result for SHA-256 b480ce03dde2e983…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 19:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6475fd7582028732760d44cea8e901c7 SHA-1: aeec307b32cce940a4c4c9c8c81f2dea2081678b SHA-256: b480ce03dde2e9830b4a93ea8fe8ecfe93cb272ef7b52fc6086cce49fa935b39
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, a common technique for executing malicious code. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 https://vipbeachhouse.com/uploads/editor/file/pepazafebewe.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2f57578---tetafikovewala.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/20747853938.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/29864330100.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/82923413538.pdfIn PDF document text
    • http://cycling-software.com/files/file/gesokamamovapotusozujed.pdfIn PDF document text
    • http://podarox.ru/public/files/93698546464.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/92043005399.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xopelubozado.pdfIn PDF document text
    • http://leeandrewdavison.com/download/gofoxidigapetilija.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/85203906322.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631323673_28ee665cc6.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/memirupeg.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/61574989477.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/97179429296.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/11731581394.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/gisepomuzu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c58e4bca8797dd8130560480840413df/81527460288.pdfIn PDF document text
    • http://freestyler.cz/img/file/mepojofenaweloxof.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/wudevumizenosugug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=space+and+time+meaningPDF 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_off0000ad0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0E 17120 bytes
SHA-256: e4aa4ae3d449246f797e339a97ab64e1da7dedb0a39653474f9e058b71d84e9d
font_01_sfnt_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10496 bytes
SHA-256: 5788cc22115a0ee5d88ec3a973bd112d6b5011364d82f3146281f728bca220c0
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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