Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb3207b6cab625f…

MALICIOUS

PDF

87.4 KB Created: 2021-03-14 19:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c2a5d5e1d54a6012be8f7c321a710c SHA-1: 7632fae061763fe0258cc6a509825a109f4f305e SHA-256: cdb3207b6cab625f981f7d361f9b97ca25da2f8a3fbfb1bf8a5d814a72cac9ce
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of generated links. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://jumiwimov.ru/wix?keyword=petsafe+deluxe+in+ground+fence+manual
    • http://latibonega.iblogger.org/moxenijidi.pdf
    • https://static.s123-cdn-static.com/uploads/4476954/normal_60047b622eefd.pdf
    • https://cdn-cms.f-static.net/uploads/4377100/normal_604d4770d7ac7.pdf
    • https://cdn-cms.f-static.net/uploads/4413110/normal_600e5e9770e71.pdf
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/5564089.pdf
    • https://xudujebu.weebly.com/uploads/1/3/6/0/136090205/novifanawubobirez.pdf
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/gekoperavorokisu.pdf
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/sawagekapifeleg.pdf
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5ff65b306b24a.pdf
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fd04021928c1.pdf
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/rejulegemunibovokubo.pdf
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60436a7ed8c5c.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5fd3a0fd11200.pdf
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5ff9c5a0846dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_2730ed92d93346618a9385a4911388a8.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_21685b8f755a4ea380caacfeff812e25.pdf?index=true
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_41cbeac01eb346b99d1e4d127d5ed14f.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_20583deebd3d40128873520ece8012c6.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_5a4cb420cf3843088f7372ba1cf9b81c.pdf?index=true
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_dffe582f26da4d1dac7de3618219467d.pdf?index=true
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_9563c6ebe97644a2bf14e1a2b612092e.pdf?index=true
    • http://tejugezefufuli.rf.gd/jaxitejetekux.pdf
    • 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_off0001171f.bin
2fc990ad4b86671b548115f2427ac86d6cf5e45780c7f42648befb23c6e3a66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 5412 bytes
font_01_sfnt_off00012978.bin
9d86d9456af8cbc9656bf1ce5dc5a9c58ed766c5d07fb12e7f8e1ae1e178e23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 11280 bytes

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