Malicious PDF — malware analysis report

Static analysis result for SHA-256 147e83e6913c976d…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 05:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47e2ecb8d92acf4a4e67ede56428a2d0 SHA-1: 6b6920cfee9574a1bb7a1080bc56a892baf0f03a SHA-256: 147e83e6913c976d9718b3af668648054333f8f4d8d3a1601cb5cdc9286a017e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://morganmethod.tuesdaytrader.com/ci/userfiles/files/43221011147.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f9cea8af2b9aa0c4b54235f0fccbd849/jabenisi.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/66207949133.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/89881252786.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/62819917871.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/bofober.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/budoxonutalojak.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lenavavogesotoxebofu.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/57111117749.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/19387750223.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/werebateviviwigunosiboj.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/52254879470.pdfIn PDF document text
    • http://fitviewer.de/files/file/37720554700.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/14045532525.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/72470191912.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/wupuziginagonelim.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/4245291506.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210925_175618.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/tugopumewuwesov.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/44269541178.pdfIn PDF document text
    • https://angem.fr/userfiles/file/giwuxaki.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/923fc7febed4c03da35bbf112d8f376e/72041985309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=maths+quiz+questions+for+class+4PDF 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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10808 bytes
SHA-256: c3179b7d4930412c2afb222cd7f3be75ef0469dbcbc4625a8ab9945cac6f289f
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 19004 bytes
SHA-256: 9eb3b62828d7159a4ee8fe84d4c04fe1bf599f4634c8f6f955ff4ba190efcd1b