Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be5fab74c5b9e44…

MALICIOUS

PDF

78.8 KB Created: 2021-04-02 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9baedc4ef549677941f31351a118991a SHA-1: 9d92a71517795ec4722f1efd193768951d48d086 SHA-256: 2be5fab74c5b9e44468a62cba7f4187bf5ba9fb66701e826ce63aaa3b2271d07
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=lev+vygotsky+zpd+and+scaffolding PDF link annotation
    • https://logugutixolug.weebly.com/uploads/1/3/5/3/135393325/b14aa4f7d.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/hhAqjeF/xofulodoxo.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/2570f3b37e.pdfIn PDF document text
    • http://ionatr.fun/835323288567lx0y.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/jjjcHIE/bikiwumev.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/4480160.pdfIn PDF document text
    • http://dwatches.site/wizards_unite_magizoologist_skill_tree_guidee29or.pdfIn PDF document text
    • https://cdn.sqhk.co/mejapevelu/jaEjdij/72604466634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_fe9e4803bdac4ccdb4eb222286ff947b.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_40d84fcd13de430bb8c1fc9e6686773c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/xufikofigitaremawekuf.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_be20636ad3c341d4aaccfd3e216e7c14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/connectives_in_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/indefinite_article_worksheets_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/vinuberopatif.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_4d74c128899a48a1a7c3b0d18472be4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadobirak/lulupasan.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_158a42b5de104b5c8c47f0b9cbc68cc7.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_6006163f460a4bbbaa23c2a75c085993.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_20a0397c91844fc28b8baf00dee835e5.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5232 bytes
SHA-256: 1bfaa2341acba738d09da45276b3e6fea3f0572c71b2dbce4f80d677b34be6e8
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10784 bytes
SHA-256: 9ca64fb71e830d411949f66649ad96d70ce2bc65371a92439565c8d9f9ec7c73
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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