Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e3ffca38e354e4…

MALICIOUS

PDF

76.7 KB Created: 2021-05-24 12:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5051a8ce45f68fb723d420371fe078cd SHA-1: e4c942536294f8fba228e32a9f004b58ef69c89e SHA-256: b2e3ffca38e354e4921edcf945d6fc77c0e699bbbf5f3316775052dafb9e20a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The primary external URL, https://jumiwimov.ru/strik, is likely used to redirect users to malicious content or phishing pages.

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://jumiwimov.ru/strik?utm_term=the+norton+anthology+of+african+american+literature+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369917/normal_60463c639f402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fd37a3a8b349.pdfIn PDF document text
    • https://xokufilamiv.weebly.com/uploads/1/3/1/4/131437438/rexiva.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/befujigariv_difofarevulub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6010ae82b74a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_600ab6604df06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_604b45adbcfe7.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/5395102.pdfIn PDF document text
    • https://jumozapanase.weebly.com/uploads/1/3/6/0/136001057/ef7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_6063c894cfc2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6015fc7c2492a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_606024f96b07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6031c0417a155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_6022699273980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_60558744f0423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6043ffebf3c6c.pdfIn PDF document text
    • https://zunelejodimoje.weebly.com/uploads/1/3/4/5/134526095/2f862f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_60502512e9798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_6062be8444280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5440 bytes
SHA-256: 541d036ae5a7983a29960cd685d615e05808c3622d5dd6d64572269156d91b3a
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 11352 bytes
SHA-256: 28ce0eac57ed3518aa482bf62f85a4cb6f46f56ef5b9a73ed7c6f732d733293a

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