Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3490226eab577e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 06:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1d4ab23dff2d8a05fb386f7d4de8479 SHA-1: e39b286992759a6d78f53b96f6b42bf4ebcbcfc1 SHA-256: ee3490226eab577eeb8d35f90b4fd1030da82272abfb4d11b7435f78b7bf9cd0
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 PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://confidence-ist.mktechsol.com/ckfinder/userfiles/files/74567021723.pdf In PDF document text
    • http://alburigiott.it/userfiles/files/78418893117.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vakesoma.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906135259.pdfIn PDF document text
    • http://kdekdyjak.cz/data/50734485195.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/72804910661.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/26617241874.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tobozopevopibop.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/7362678999.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/refizixerevamag.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/peder.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/47918387172.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vurifuwufokifuro.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/16025873406.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xuwobilex.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/sojugedef.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/derojilaninutewa.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sizepuwalamewa.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902230759.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/17643176242.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/roxuregadamepejovobipax.pdfIn PDF document text
    • http://chpcentre.com/files/file/gakebosogamutipekixekoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nds+rom+freePDF 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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 17748 bytes
SHA-256: 622bc4eff0224e9536b7a03bfbd82df08807a21ec908e2aef7ae2c2bb903a156
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 9992 bytes
SHA-256: 3981dd43d0ef2db8cbc9aaf8378c2edbc0fb5550268af703725132ce4ae77d8a

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