Malicious PDF — malware analysis report

Static analysis result for SHA-256 c721964342411830…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 23:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 62a43064f723a4c4a9f7c2d45ca85c39 SHA-1: ab770fa245f0a4aac4afe5ffcd5ea1cc01032ab0 SHA-256: c721964342411830cde11b3e037c694810cd29dae5ef505140a3d568b84dce08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chemonova.com/FCKeditor/file/pibepanumulumotewedafuxa.pdf In PDF document text
    • https://jagamimpi.info/contents/files/tekewomipozuwo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/diwoladaxokopatozalari.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4055b4fd---belez.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b4eb7e89777c9534d085bf85c50277b3/lafesifo.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kapun.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/95543337628.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/nawatoxefozawowuretikupiz.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/63539274496.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/24540707388.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/19115927603.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/28906642784.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67379460239.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/gubuli.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bebowubematoposudixevibu.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/22611338655.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/wivogazurabimi.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/93969310127.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/53465841492.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/62001255048.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/12703024508.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rivujimere.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/niroka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crear+aplicaciones+para+android+con+visual+studioPDF 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_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 18476 bytes
SHA-256: f04acdf2c5510b3a642074d8769635f381fdf0e60ad71b19f244b782534f3147
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 10704 bytes
SHA-256: ba5f7698947dbbf32e24fa70f1163c828f4a8eec82e62e5055d0d189457fdcdb

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