Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69b23b98b5907dc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 18:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 816294e81f08cc0e87c92185522dbbe3 SHA-1: 5ea0f1202f86ff34c9489005199bb016879a776f SHA-256: e69b23b98b5907dc22d9b623528cf014716b8311152f1b8a7c6f87d8667419c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to external URLs for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=tcp%2Fip+reference+model+in+computer+network+pdf PDF link annotation
    • http://asavn.vn/uploads/userfiles/files/21859850498.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jiwubonosigakatagin.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161357d1f7e726---ribavubata.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/5589083753.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/40531312667.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jitifivinadijukubib.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904073018.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/84551599498.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zawedoj.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/44408742469.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/vikofumok.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/87259349756.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14340548526.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/85920487532.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/vesefigumutotuwexusuro.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/80937315551.pdfIn PDF document text
    • https://gdaniec.com/upload/files/19559010865.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/26883629403.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/sowunole.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99334106580.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bimugebo.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/moliruradodovozik.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/97323421473.pdfIn PDF document text
    • 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 17564 bytes
SHA-256: 7fb9c952432875d47af31f1d3cfa1287ce5791cd4aefcd944ab818ff448ed8c6
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10724 bytes
SHA-256: ae1b5ce2b59e767da4b560320eec09b8fa0f2ca46e239f1d81c3e199c75e57eb

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