Malicious PDF — malware analysis report

Static analysis result for SHA-256 944ee9bbfce1c724…

MALICIOUS

PDF

71.9 KB Created: 2021-05-19 12:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f3e0d61257214054d6757c35039aa39 SHA-1: 7c3d1fcd5fa5eed5494dc6d4a041739a555351bb SHA-256: 944ee9bbfce1c724a134ae91a883e3e457f71493bef39bf1842fe0b04b924c87
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure also shows signs of manipulation with duplicate object bodies, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=describe+the+different+types+of+rna+and+their+functions+in+protein+synthesis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469128/normal_600841e3788d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_6008a0bfbbc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_603151654e6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_601c8c759cb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_603c21fa38377.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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5452 bytes
SHA-256: bb6e0167d7ea800c5d8172fa5a7d401a9546094c3592a8872b266f6c09231225
font_01_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10236 bytes
SHA-256: 41690faaed6ea38cb8b308925b6a0f3d88f2f47969831508386cc2bf54bb6fc6

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