Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedccfc04f03a65c…

MALICIOUS

PDF

79.6 KB Created: 2022-06-01 00:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 19df97efe87073770aa4728dd9bb09d0 SHA-1: 529e27b6b42bca5017139ffd242c6218dd025397 SHA-256: cedccfc04f03a65ca3f66fd00e727f2164ae8edd398d1511deaf99a5c5fc6a45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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.
  • 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://colod.co.za/YmrXLWy8?keyword=english%20grammar%20worksheets%20for%20class%208%20cbse%20with%20answers%20book PDF link annotation
    • http://greeninfrabd.com/assets/ckeditor/kcfinder/upload/files/wasufojutabewezubunifa.pdfIn PDF document text
    • https://hainescentreasia.com/images/file/73697188569.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/miledupemokegakejimosejaz.pdfIn PDF document text
    • http://formasrl.com/admin/kcfinder/upload/files/ralofejirosedivu.pdfIn PDF document text
    • http://kptar.com.br/kcfinder/upload/files/36360530866.pdfIn PDF document text
    • https://vuwarudud.weebly.com/uploads/1/3/5/3/135314702/110268.pdfIn PDF document text
    • https://htkvn.vn/public/admin/plugins/kcfinder/upload/files/92034176561.pdfIn PDF document text
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/zesuvarum-ragimufikona-sipudabowo-zonapivogimu.pdfIn PDF document text
    • https://pupupobinizoto.weebly.com/uploads/1/3/1/3/131384436/464060.pdfIn PDF document text
    • https://jfd.news/app/webroot/uploads/files/soxoxebosevosesawisafe.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kovuwulalidolifagokapadi.pdfIn PDF document text
    • https://kutabafimuv.weebly.com/uploads/1/3/1/3/131379381/tovufavafesijiz-zapawowe-kizabovemapome.pdfIn PDF document text
    • https://www.ibericaseguridad.com/admin/kcfinder/upload/files/kezutefugaripigom.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/30971579149.pdfIn PDF document text
    • https://dominegum.weebly.com/uploads/1/3/4/3/134370126/wutimufureb.pdfIn PDF document text
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/kinijisolapejujo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/pixuwofifizukupinore.pdfIn PDF document text
    • http://kanalizace.instalace-charvat.cz/userfiles/file/xubuwew.pdfIn PDF document text
    • https://zasosefudasu.weebly.com/uploads/1/3/1/8/131856937/xetuwat_jobanaviju_japirixirasu_zivevoniledob.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/wekonapi.pdfIn PDF document text
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/234123.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/gosinuxaxaxanubewutid.pdfIn PDF document text
    • https://dasabuponexax.weebly.com/uploads/1/4/1/5/141509820/texawuxozisifi.pdfIn PDF document text
    • https://xafuraworeduvux.weebly.com/uploads/1/3/4/7/134752052/pewaferugumono.pdfIn PDF document text
    • https://funstoreus.dialog.org/userfiles/file/78370823052.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/fuleterapifimu.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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 11292 bytes
SHA-256: 72e7c163b91524b435f829cf3ddb229f8f0e7202ec3ac2871e75c3e297890240
font_02_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 17392 bytes
SHA-256: 24670f82e88456ae6434ced4411f1da73ef253adf5f0ddc0741cae36a4b22763