Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8afc6cf3822c0df…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 19:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da1837022663df7327c33906e11fe9dd SHA-1: cea7fd66e57f589e5bc833d93da5c7487a3df757 SHA-256: f8afc6cf3822c0dff53bf46ec68e355b0aca91fd5f27a261b742183c919e2b3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or link-farming attack designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://bpsstudio.hu/uploads/88408828805.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/67270255772.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xexumipe.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/vitabivumevipukax.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zudilokozavekojufogiruge.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/75732534633.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/99596962050.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/zatel.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xunedojokuliralosufifo.pdfIn PDF document text
    • http://erictex.com/ufiles/files/24214218464.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631186310.pdfIn PDF document text
    • http://feg.vn/uploads/files/98207311026.pdfIn PDF document text
    • https://2acontractor.it/images/file/50437709838.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1ac555b3---74679505002.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0b40ab87d9a2f1ecd0e6eda0573b1676/jujurabu.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/kurokonomabenajosam.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/wunukumubafez.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/61724349989.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/dodaxobazibate.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/girejixerudedufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=madout2+city+onlinePDF 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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 15656 bytes
SHA-256: cf61df1a4e2eaf0d655f7e5f52b4ae32da70647f5f6bee689f5cc6b9e9d7dac8
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10420 bytes
SHA-256: 830b45cb1b843004e07c1b475a6afe846c88442e16acf715c27519e7af478691

Open this report in the interactive analyzer, or submit your own file for analysis.