Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e3a37a9f19b6e8…

MALICIOUS

PDF

80.1 KB Created: 2021-05-23 02:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5a90f8a279b8f458ee03ea06621fa47d SHA-1: 72693a97130dea0ac1f5513466999e03d52b5558 SHA-256: 20e3a37a9f19b6e85f190d278e8611ac41aae1efa3d08f5f2d5791db3bdc92f0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=can+you+type+on+chromebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422133/normal_5fcdfe81aad77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_604cf74133679.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/nakarikajofizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fe885e92e2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_606962ede8b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_605fa1fac89d2.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/1bf83f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_604f58e184847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604d01cc136b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_60279313400c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fcac9f819235.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/3325151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6045e5a55dad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5fd3bfe80c8f2.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/1750c5d1184e4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_6000c0f4e38eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459926/normal_5ff4df041f107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fce917e2f733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_603198649276b.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/bitajemisajoz/59967943832.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/tupuxenudu.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/nevetanixilikokuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/44914139974.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 5176 bytes
SHA-256: 60cd0af891b2dab433394da6589f73bd07fbd8d4aa57696c0734c52421ac6052
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10776 bytes
SHA-256: 5a60c6cf04fb33872492407b0511d4bb7ae308fa1efc3b31dc3bdcb5625377d5

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