Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d98789e74a0400…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 14:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15faff7abee08e8c8bd5325250f7aeee SHA-1: 8f6cfe02c1ca410c72d9f8bde73e01bbdac16bd4 SHA-256: 30d98789e74a0400b0f2e1e87941d205f649dc8b55ec2b665dc761c08392c5f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://www.vnos.vn/app/webroot/uploads/files/kelisedowatatilazodubof.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613874d3384fc---20929355913.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/12928877894.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/rezagogimuwenit.pdfIn PDF document text
    • http://consade.com/userfiles/file/94467003198.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/waxeruzenolijejezubijiduw.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db60a61cb5---posupekizaseli.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/64591833702.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/bevoxutazaduxutamanadigiv.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/32614134693.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/nobawatevidi.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/zenanedajadesimixali.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/83909495854.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/1953403595.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/gilodamisevewararefipesu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/11282037381.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/24450247975.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tudurujo.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/76949167180.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/rikedolekukuzudi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/24888964033.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/fazunazegekumojopoko.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/2827837208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adwords+keyword+research+toolPDF 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_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 10544 bytes
SHA-256: 87bc33c78daef545405468a7cc54a41f44b991c38dde417005775866b4c6595a
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 20872 bytes
SHA-256: 2857521b2ee13f86bcdfb89b7df5682907f3e287ac7f5da0fd01d4ae2d97bf65
font_02_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1