Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b94be4105e87f6a…

MALICIOUS

PDF

70.0 KB Created: 2020-11-17 15:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5535da583d52627f35ba994f6599893 SHA-1: 2d165b40650b08b2b581477ad514463b14b07a20 SHA-256: 2b94be4105e87f6a2efefa5998a8bc5ba1024695e2f51a1ee3ddf97315d00a63
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI, 'https://trafficel.ru/strik?utm_term=twenty+boy+summer+pdf', was found embedded within the document, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URL is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=twenty+boy+summer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5f9be3a7a7afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5f962d3e5999b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f89c710af571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8e284556070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_5fad4caea6a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f8fb6e054b05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0314da45-9e5b-4851-95b4-7a5ab62365e6/dividesozokusogepanirari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab13a327-6e82-43fe-b847-59e1724de621/5121234079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e152bdfe-ef7c-48f4-9e21-fd3827e791f0/suvexetuxaxunifijuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be526a6c-d2cf-4369-91e5-d7e1dab94e94/juwuzuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266605e0-8c71-4d8d-958d-6c49bf759a95/fry_1000_words_unique_teaching_resou.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 5060 bytes
SHA-256: c2b0c47d6a1c66ebf590026026f1f7dc7c239104ed81b44af4c4c9697e771dc7
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 10020 bytes
SHA-256: 965c11b39190bfe190f3152769e4ea53458f492fce00d0c33f56b0f2efac660f
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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