Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ea12a05ec31d6e…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 14:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68dee48841ff4882161a670c907e4201 SHA-1: d7f510e71faf93144b8689555d5ad9d4d9fbbdf8 SHA-256: f4ea12a05ec31d6e6242bc81c246afdcfe6b44cd6a6ca1bdb18f38de93afcd2c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffine.ru/strik?utm_term=rain+barrel+pump+with+timer'. While no scripts were explicitly extracted, the presence of numerous links and the ClamAV detection suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=rain+barrel+pump+with+timer
    • https://pilopumif.weebly.com/uploads/1/3/4/7/134733378/5048163.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_5fbb40caaf871.pdf
    • https://bivogovaxi.weebly.com/uploads/1/3/4/3/134320375/b6d05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ff71dbb-314f-446a-9c02-c2c0a8fbb036/kirakira_precure_a_la_mode_op.pdf
    • https://s3.amazonaws.com/tawosutosuxi/trauma_abdominal_atls.pdf
    • https://uploads.strikinglycdn.com/files/fd944816-3f90-4d34-ae0b-2a983146ce7a/niretu.pdf
    • https://uploads.strikinglycdn.com/files/5e3a633b-a384-4c01-9d59-81b93e1f7f61/las_partes_del_cuerpo.pdf
    • https://uploads.strikinglycdn.com/files/74690cfe-2f6f-477b-8e33-043335784a76/49472361433.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_off0000cc46.bin
1f95970b2904bb2d04faf5a6a932c00e0c618274960811992a30c6a17b517cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 5120 bytes
font_01_sfnt_off0000dd94.bin
cd11b70ee268fe5c217b1a5e64680490bb5a774f23087af18b8621928d63e3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 9944 bytes

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