Malicious PDF — malware analysis report

Static analysis result for SHA-256 259f354984bc27da…

MALICIOUS

PDF

70.2 KB Created: 2020-11-14 11:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: eb3708eadec003941350c11e6b9dc2de SHA-1: f158d48e9927e05f19a625fa39e43a34a1396f29 SHA-256: 259f354984bc27da0cf2cf54300a4120d7ec6e166208a951422bd9e45e14a7d9
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'https://trafftec.ru/123?utm_term=modern+spanish+grammar+pdf', which is a strong indicator of a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further confirms its malicious nature. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated, but the presence of the external URI is the primary driver for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=modern+spanish+grammar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87ac66772f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fa0fd9887540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5f8d830a8970b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_5fab76613bff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8b60d6331db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5f998d86b47fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f88940d9c5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f8873892c0eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9ebe53-1505-4458-88e2-27f4f27162c1/2_samuel_15-18.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/susiwutunobubemigipiwif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e079c9aa-b506-4bee-8911-15e2b20a0d19/fasurux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6343ee47-55a0-4b83-8e8d-c5dd6b794a9a/27139670265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058b084d-b525-4d86-b274-5ce9cfe6dcad/19716237876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7fccc3-41bf-4b42-90ef-c86fa9148bef/60365154614.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 5428 bytes
SHA-256: 60bf8ddd89404c579c8ad240873bbe22b164fd56943c31582929441dc94f6cff
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10564 bytes
SHA-256: 34add8d89f80305b8c680d63b5b07483ab0c41f73fc94827f0304f5d87d313d1

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