Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d94e1cf4482d628…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 15:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b8096ee13b9d97bf04f8b5d3bb2c60b SHA-1: e419c2c10291f297cbda11cdba3a9ba526a72bbc SHA-256: 4d94e1cf4482d628dc7be1162581fab63b3beeca52d824ce7cc9e4dd5e352d5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://specialgarden.ro/userfiles/file/jisawibisagedibami.pdf In PDF document text
    • https://avflash.nl/upload/files/wuzenuzuwejejurel.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/53866015702.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejap.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/59911766095.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/mepozivelugusutogiso.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mosurelima.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17cd588db---39563550716.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/58559702719.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/jijitozu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/wepara.pdfIn PDF document text
    • https://mytopics.it/uploads/file/xapofetepamekuzogalumil.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/piloganijoxodi.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88148368076.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/kemenuxafilenikadomawu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/finikaxunojunetinor.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ceb51ae1c---15263868656.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lepebewer.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/pibidavifelepixa.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77269338164.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/95858438008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ex+kernel+manager+apkPDF 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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10292 bytes
SHA-256: e4cbf915c634ead1eddd1d3d5b17bf6892929278f8683dffe9349a1d0c39a228
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 20168 bytes
SHA-256: 6c84acb99e4e316c52566d8756d3b53ecadbb290dfd81cd1cdf7e97d9985e13f
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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