Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f99e5d66831251…

MALICIOUS

PDF

84.6 KB Created: 2021-03-09 18:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c2ab01da1c7c164d1ac708e9c245c34 SHA-1: 7d6e71094a1b486b3ce553b764b8709c22541823 SHA-256: b6f99e5d66831251d8f1791f5bb650ab3d2e3f3001dea0d494951c9855bc1c77
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=fossil+fuels+worksheet+6th+grade
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/5835682.pdf
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/c6a03b3b.pdf
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/radipidakesu_kizufo.pdf
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fe92197e9228.pdf
    • https://cdn-cms.f-static.net/uploads/4380876/normal_600a1b61aae57.pdf
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ffac56dc6a82.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd3d69e56ffd.pdf
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/morod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusixa/95804334608.pdf
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_5842ba6e333542d58d4b03ef8a426db4.pdf?index=true
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_1f4f4ae1c2e540b6953782b732b2c656.pdf?index=true
    • https://s3.amazonaws.com/xonobijikivo/epoch_microplate_spectrophotometer_manual.pdf
    • https://s3.amazonaws.com/fejenijovekozu/cancer_cachexia_guidelines.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_e196f23d1f764b669b6967777d930300.pdf?index=true
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_40a4878260b34733b3a13ac903946f0c.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_414f47ba1e2b47a5b73c7d2dd571a467.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_1956fbc2e595499b84d76b8fce579bcb.pdf?index=true
    • https://s3.amazonaws.com/womirofop/34186905988.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_99ad1c51b5744d8fbb22e51550636132.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_df55a4ca9a1d4fc3b328b36c6dc4a4ab.pdf?index=true
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_202c4d691c444c8693fe417555eef660.pdf?index=true
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_24ad9ab004ae4c2abecf37d0ce3f7b04.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e7.bin
c6d2249fd669d8b2e402ced9dfac5ab8f0e26721dc35ff6a0b89c4c16b10f7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 5432 bytes
font_01_sfnt_off00010b75.bin
beaf5259b33ec2ba248c9ee4f0f4173c091c16b3236e5933e18ff18a86e4ed41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10468 bytes
font_02_sfnt_off00012f8e.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16068 bytes

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