Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9ad525d57bf7c0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 16:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6edcb6ca1f02e55a7d91c82ca72de035 SHA-1: 4b9d72667d0670501f3a9ceeb934c025ee1b6913 SHA-256: ea9ad525d57bf7c0d38e3e1a6f5d47ff6da3422727d035f72245a6ede173aa42
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 redirects the user to external URLs, as evidenced by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://vesimport.ru/userfiles/file/juxekiz.pdf In PDF document text
    • http://tdbakademi.org/userfiles/files/kitabevunagemuwa.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bixavowovekixopobedada.pdfIn PDF document text
    • http://lg-palette.com/upload/files/xinupomawogatu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/7025412393.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdfIn PDF document text
    • http://badgerhillfarm.uk/pukoliwawowixamenenivil.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/73841218737.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/35103659945.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/76856211019.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/xajijufidewup.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/nevufaki.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/14722513513.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/43175276116.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gajarogimukivolovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=play+store+history+deletePDF 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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 10356 bytes
SHA-256: 7d9597301713a60c05d608cc67ccd06043cf80d2f4dab99ab85d0eefe9d4fb02
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17560 bytes
SHA-256: 985b12c51a87caf3b0b45f0c6501546bbcea12f06e1068d4237b1106da830d53

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