Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce0efdc2f1c9f83…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 12:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42fa258eab4a45efbf7e5edbfeda8123 SHA-1: eb747e12c29aae54821a201a06fbf3af86c63b96 SHA-256: 4ce0efdc2f1c9f83e20eaf1659b05282a3af9daeef3531e149bf1d67b1a15eaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://premiumcsp.com/uploads/files/14117177989.pdf
    • http://tvkinter.com/file_media/file_image/file/kipogogurebawodoxaf.pdf
    • http://svatba-emi.com/uploads/pages/files/34783272504.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/17399369362.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/36292607436.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jum28ldp06ed1cdkno1ve5a4t1/piwifazizeve.pdf
    • http://greenvisioninternational.gm/userfiles/file/44917412764.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161341b711a771---poxezetezik.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72820767790.pdf
    • https://sportnazona.bg/f/uploads/files/vusadugazotatixodijaxuf.pdf
    • http://szakkepzosiklos.hu/upload/file/zumegubutil.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wulefivazimeg.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77462309286.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/gulugevu.pdf
    • http://farmina.ru/uploads/files/54876961585.pdf
    • http://daimarconstrucciones.com/images/admin/file/53493392462.pdf
    • http://movietek.vn/hinh-anh/files/xukafuwifuwaritilofu.pdf
    • http://pn-tech.net/userData/board/file/74539902952.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/83675148107.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/metobobaju.pdf
    • http://kirakuramen.com/uploads/files/ginit.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/69282911610.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+t+install+any+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7db.bin
bc7cac9447a6ba6eedeeb5a3420d0146b5a383c7920b2b819230b3824d52dff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 17956 bytes
font_01_sfnt_off00010610.bin
7e2182cc6ea17e1e7a203c63aab59b6166340ae918d9e1e8c8f7133d7a19a275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10400 bytes
font_02_sfnt_off00011db9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 16792 bytes

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