Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a396943cf738e4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 04:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ccb70c637f67955131c187f7db37558 SHA-1: eceb61db44eac290599b45b966a3e0f7ba252ee4 SHA-256: e4a396943cf738e4b5bb2bcc08ebf8fdb96bcce798c10ec5b5ea1522b9d254cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded links pointing to disposable domains, suggesting a link farm designed to host further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cosmeticdermatologymiamibeach.com/uploads/data/files/bivodiginiropizu.pdf In PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/21767702929.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zepuvu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/tirubosojelojoz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01af10ec4---46172235963.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/50918075533.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_045632.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/56559319234.pdfIn PDF document text
    • http://stattus.com/assets/file/67622487076.pdfIn PDF document text
    • http://fitviewer.info/files/file/28280167665.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/fusapuw.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/6111963771.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/jalesemuvadepar.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fibevijolapopodulejes.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8eaea90f26e6bdb4c7f5455b0113b4e6/15009446556.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/50142725153.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73425584859.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/83385453470.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/90634807163.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/6163957670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hungry+shark+world+ps4+cheatsPDF 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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 17256 bytes
SHA-256: 46c0ffee00931ac4b7f73ca01afc7c1687e5570b270d365091766e5bf1248d68
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 11160 bytes
SHA-256: 21ffa66aee8fff8e8d7bd352ecba1afa7058305a63b5b8a82f386b8e597fc36d