Malicious PDF — malware analysis report

Static analysis result for SHA-256 1910ec661c0846d8…

MALICIOUS

PDF

66.2 KB Created: 2020-12-22 19:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a704b46f5e8252f5ff4eeafa1915981 SHA-1: d4a5dbecbc21043de9b29afa6d5060207b79b768 SHA-256: 1910ec661c0846d8a5f2b3a3f7cc12d4c47bdb2ba71c027f8f388e5ecb7298c4
96 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and an embedded URL. ClamAV and an ML classifier flagged it as malicious, specifically as a phishing trojan. The embedded URL, https://trafffi.ru/strik?utm_term=cross+road+blues+lyrics, is the primary indicator of malicious intent, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=cross+road+blues+lyrics
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f91a80a14533.pdf
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fccd5dcce4ff.pdf
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fdef7698f4d3.pdf
    • https://cdn-cms.f-static.net/uploads/4424682/normal_5fa12cd6f283b.pdf
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fc4e87ff3f80.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fce1135cd8500165ad46e80/t/5fcfbec067fa953b722fe92c/1607450304938/natuku.pdf
    • https://static1.squarespace.com/static/5fe03cfed61098631978a4f3/t/5fe0f9323cc797738fb490bf/1608579378517/dcma_cpsr_guidebook_2019.pdf
    • https://static1.squarespace.com/static/5fc5c5aef7cf8c75404c2941/t/5fcea0e8c9e098024023a41d/1607377138635/1935551125.pdf
    • https://uploads.strikinglycdn.com/files/81f6eb9b-ae18-4677-bfe4-28a2b5b70b7b/james_anthony_welker.pdf
    • https://uploads.strikinglycdn.com/files/06c24c2e-cb84-4973-a2b5-9d85e9244804/differential_volume_element_spherical_coordinates.pdf
    • https://uploads.strikinglycdn.com/files/428ac4c1-23c6-4129-9ef5-a9453e2b6740/zexafin.pdf
    • https://static1.squarespace.com/static/5fe00322ff074777c9865bc0/t/5fe0b3740f6c913d4426f854/1608561524435/fundamentals_of_organic_chemistry_solomons.pdf
    • 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_off0000c75e.bin
3e65f7a9323c3d46c454c737f8223fe32cd4ee784a40ec9e287b513d5cbdec6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 5080 bytes
font_01_sfnt_off0000d8af.bin
4f07abdbc8e6aadbc88df1a576f48a81fb042213e384833a74d213ed35d95bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 10532 bytes

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