Malicious PDF — malware analysis report

Static analysis result for SHA-256 591581e286c4815e…

MALICIOUS

PDF

79.1 KB Created: 2021-05-28 11:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b557cd27d3b9d5d430a8aa1f3ab0e797 SHA-1: d3fd862fa99de2385ad7d9cf7dea1f53240b270f SHA-256: 591581e286c4815e0828c37029aead1ac60e956191916604ce3163b56719786f
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to resetting a radio scanner, which is a common tactic for phishing or malware distribution. It embeds a URL pointing to 'zajinet.ru', likely a malicious domain used to host further stages of an attack or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=how+to+reset+a+radio+shack+scanner
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6035fa1801494.pdf
    • https://static.s123-cdn-static.com/uploads/4488806/normal_6004f10345a9d.pdf
    • https://cdn-cms.f-static.net/uploads/4489983/normal_605fd31b03cf9.pdf
    • https://cdn-cms.f-static.net/uploads/4417128/normal_601b723a6bb0d.pdf
    • https://cdn-cms.f-static.net/uploads/4403683/normal_60302e91c0698.pdf
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5fe0bb6aee1b5.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6033b43171063.pdf
    • https://cdn-cms.f-static.net/uploads/4474997/normal_6028310040615.pdf
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5fe1eeed947e0.pdf
    • https://cdn-cms.f-static.net/uploads/4407998/normal_60403a3aba868.pdf
    • https://cdn-cms.f-static.net/uploads/4369333/normal_604b08cae2c73.pdf
    • https://cdn-cms.f-static.net/uploads/4505125/normal_602aab7576073.pdf
    • https://cdn-cms.f-static.net/uploads/4489839/normal_606c8c6a63cac.pdf
    • https://cdn-cms.f-static.net/uploads/4485929/normal_60297c7b59824.pdf
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2ba5d74373.pdf
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60216aa8a6545.pdf
    • https://static.s123-cdn-static.com/uploads/4451033/normal_60028a5ad4402.pdf
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5ff64f704643b.pdf
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60102b0327c47.pdf
    • https://cdn-cms.f-static.net/uploads/4459464/normal_6044d3b1ae75e.pdf
    • https://static.s123-cdn-static.com/uploads/4409813/normal_5ff7130650877.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fd78ab8c9079.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_60436b86b39bb.pdf
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd38d1c46cb0.pdf
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6062824265569.pdf
    • https://cdn-cms.f-static.net/uploads/4408330/normal_60183498ec174.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f763.bin
032736e11e6b448cb4e32c346587377d28bc9261645d49da614423f29f9bab02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 5112 bytes
font_01_sfnt_off000108d0.bin
5e6921840b839d3991b9210dd239f564bef6a258582327cbb49d958fbeec4966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 11208 bytes

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