Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6cf40ffe42237d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 18:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f12a62464295041a0797fbec43a042e3 SHA-1: b07eeafcbf6695a13b248a85d2c098777555d98a SHA-256: bc6cf40ffe42237ddf82dd206449d7870525d9745f51a6555a28cf42280e2a0e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, directing users to various URLs, including a suspicious domain 'kuzutuzo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://kuzutuzo.ru/award?keyword=concierto+de+aranjuez+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fcdadde27114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_604783f485f86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fe0fa24a1ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_601fef7cacbfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60482247e6d5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_6000dd098f3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fd85b59d5ea0.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/40348108395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fd655908188c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ditiruz/vsftpd._conf_default_file.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/71974427534.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/falsettos_2016_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/tamosopemexafomubide.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/graphic_facilitator_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/daxisodixemiposizijamepu.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_0462be8b8122440fa14bcfd9da563222.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/journalist_vs_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/wordpress_administrator_login_url.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_a7b54acce0a9473e8691de7b74eab55f.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/10840286650.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/talix.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/luossavaara-_kiirunavaara_ab_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/tajuzu.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://scripts.sil.org/OFLIn 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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 5320 bytes
SHA-256: d353fb2e60e562eb90a8d54e6c3259a0b9b0a9bec7caa788f4e286766d35ba4a
font_01_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 11876 bytes
SHA-256: 513ea62b5cb266b85ccf78f255d040d90e5665ca1d71d5d39f2194782b59efaf
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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