Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1772b17eb805cae…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 17:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e14bb089119dd5965e308f080c939856 SHA-1: 69fae888f1d1be9b85fe45a3d1ee376c17270eb2 SHA-256: e1772b17eb805cae68bd560112f3381856e32cc9c66e5ff6a00575606b4976e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, such as the provided 'inwebjor.ru' and 'tefen67.com', which are associated with phishing or malware distribution, aligning with the 'Pdf.Phishing.Trojan' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=whitman+song+of+myself+pdf PDF link annotation
    • https://tefen67.com/userfiles/files/jibesasonalud.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/lebelekugijo.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/susoper.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/96196072539.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zafufalosokuranenowowa.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/detisaxijebires.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/76325682185.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613e572b23935.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16151e52f3a14f---voboximikupujovi.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/wumoxosigusakewe.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/46682813392.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/41229200066.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/mipugirigawawisutuzavapi.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/natiloluz.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/49447114506.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/61915790064.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/2195359268.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99151658159.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jizakupewizi.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/20609193641.pdfIn PDF document text
    • https://85097781.com/upload/files/gagapesorapus.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/34247411657.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_off0000adad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAD 14904 bytes
SHA-256: 9f75f2a21c828d43c78cd97f5d9c7b261d5b655c1074db4267b2478911fda8a3
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 10952 bytes
SHA-256: 7ff763d7f6f46230f0322111e68200f525b9e31cfc5c66eadcd859f9ff9d7ec1
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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