Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6832983f84bfeb6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 08:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06455227bf24b855761503cad8110e89 SHA-1: 191e7532d4fa0b21a7f72db1cf3cde31f7f513bd SHA-256: f6832983f84bfeb6ce101e2eebcebe64e3b5eee0a0332dd7c58e6b93d26d0564
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. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://magnettoptan.com/upload/ckfinder/files/21171597096.pdf In PDF document text
    • http://munnartourism.com/uploads/file/doroxogomenufu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vinurizalogakisuweduvokar.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/55064545596.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/78685717226.pdfIn PDF document text
    • http://epplast.com/files/file/41741415482.pdfIn PDF document text
    • http://recrute.fr/files/files/52043465461.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/78982675490.pdfIn PDF document text
    • http://ebus.cn/up_file/file/25059867399.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/97574176061.pdfIn PDF document text
    • http://beiks.info/public/file/84844232011.pdfIn PDF document text
    • http://rilta.net/userfiles/files/19829301923.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/36127853630.pdfIn PDF document text
    • http://progetec.org/userfiles/files/dujofuguse.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/65642475642.pdfIn PDF document text
    • https://digireg.si/upload/64568923801.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/robiletuzuraranafe.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/6357890935.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e08e4b2e4---55586144436.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f69a26788cb74950280c28d632de4fc9/77805414259.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fuvozudewemelafa.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/gokogituxiwifed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=world+war+z+apk+download+in+mobilePDF 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_off0000b9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 10656 bytes
SHA-256: 1c6c4e74cc784678a22d1816f3411a4443f4d34a7c67cb8039f081d2d6d01ea6
font_02_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 17172 bytes
SHA-256: 5559b4af7a03e5ebc533c343e44633605b4d0f1ab4f68297ec9e94ad83c5ca54

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