Malicious PDF — malware analysis report

Static analysis result for SHA-256 63800d5c52cb75a7…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 13:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8478294f8d5df6d7c9ada65aa360432 SHA-1: 23bcef75a3d52cc5947aa3b04b038155c9671bf5 SHA-256: 63800d5c52cb75a7b32daf0eda6a95545a7b6bed0eed31b66bd6f51ca85286d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a mass of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to these external URLs, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=livro+c%25C3%25A2ntico+dos+c%25C3%25A2nticos+em+pdf
    • http://busivel.xyz/geretazeluvzovs4.pdf
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/gixajikemoboba_momekiteremifo_damefogisas.pdf
    • https://pawupakupofodav.weebly.com/uploads/1/3/5/3/135388754/kevewirago.pdf
    • http://train-home.ru/administracion_publica_perulimye.pdf
    • https://cdn.sqhk.co/tojorovexuw/fpXjGig/nodusekurosejotipixiju.pdf
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/wigekemejepirijoxede.pdf
    • https://cdn.sqhk.co/zogameva/jeZ8jiA/tawizesagikowifibiwobe.pdf
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/549c7bef232361b.pdf
    • https://cdn.sqhk.co/petebeki/95AUidC/fall_wedding_escort_card_ideas.pdf
    • http://lnstagramlivesupportcenter.com/vosemesabtx6fo.pdf
    • https://cdn.sqhk.co/jojikoxazew/e18I7hg/sports_3d_games_download.pdf
    • https://cdn.sqhk.co/daxonotetil/h8hggc9/curriculum_development_a_guide_to_practice.pdf
    • https://cdn.sqhk.co/jipogidara/ge8hijb/4908017453.pdf
    • http://raisinshub.club/elbow_bursitis_exercises3rtvb.pdf
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/578060.pdf
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/xiroboropafe.pdf
    • https://cdn.sqhk.co/revinoxu/igY5B7S/gaxozeligizoxunebova.pdf
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/badasilakezevubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_0c563384b12f4587a87ca405f923c4a2.pdf?index=true
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_7c7a449a50034dc8b26957b5b341c3c1.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_36c1f44e3a3748b29f3a6a7fbf5e0c89.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefb.bin
2a43b5eff6da204fa9dc156e844ac615d0de1890e072c4c7ac3a7fa1b4a6fe4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5300 bytes
font_01_sfnt_off00010101.bin
b2097234fdbeb414544eeeb0d26d009ba6ccbd0881720d8bd81b24d3540f584e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 13308 bytes

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