Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6237b18d0374e9…

MALICIOUS

PDF

89.6 KB Created: 2021-03-31 20:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c5456ccd55112d929de10cbee5052052 SHA-1: c4e94b4f4768f08196702e88ae0f6239f78d095b SHA-256: db6237b18d0374e97c56e8be16b9e12b9a406ebf1466e1d3ccd69ffd694c660d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, directing users to various domains. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=caba%25C3%25B1as+el+alquimista+zipolite+oaxaca', is directly associated with the malicious verdict. The presence of numerous external links suggests an attempt to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=caba%25C3%25B1as+el+alquimista+zipolite+oaxaca PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404297/normal_6002d58860931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5ffad9c4a4e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60419fae911c8.pdfIn PDF document text
    • http://nawireg.22web.org/blewbury_school_ofsted_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fdbafb0a6597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_603b943ed5c31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_600292f52f075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5ffc8e52a52b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5feb5c8ec86e7.pdfIn PDF document text
    • https://cdn.sqhk.co/bixelosa/5utiiE1/drifting_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_6056d599ab22a.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/RicJiiT/wigediwemewusik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603f201b4dcda.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/ifW2gck/dance_hits_90s_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_5d386b10dd9448b4950662a481d54533.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_03aea7b02e034c63b821d868fafe9ac9.pdf?index=trueIn PDF document text
    • http://jibejobumo.rf.gd/fetatebewu.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_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 5484 bytes
SHA-256: 8c89a96d6d694f008fa35a583ca5739a904287e8a90cb7c8f6c09ab88f5d9866
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 11816 bytes
SHA-256: d77957b92b387b9e072c7f7f744707271f36c48e43f028f1124b9e17ac0c1416
font_02_sfnt_off00014169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 16344 bytes
SHA-256: 9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189

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