Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dd6b9a05849a25…

MALICIOUS

PDF

69.7 KB Created: 2020-12-07 12:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 775c17376dbd3b37d4cb7e81499cd784 SHA-1: 0e4233005ffc83d2b5b4ffd8e94dfc3210d640b0 SHA-256: b5dd6b9a05849a252844734023124eba32e0089bfed14af855d69a3c5903deeb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffking.ru/123?utm_term=absolute+value+and+opposites+worksheet'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffking.ru/123?utm_term=absolute+value+and+opposites+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_5f9ef50087719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5f9ecfbf7dc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f876f48d2ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f92094fae177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f9203805a463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f88903a098f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fbe70df74140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9e8ae02add7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fb6cbc20efda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fa353bcb233e.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://s3.amazonaws.com/bopuxosavubare/disinformation_and_fake_news_final_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/35037932400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fd5754-84fd-44ac-bec9-1a7259970031/ferimoru.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/merake.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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 5276 bytes
SHA-256: 5d4ec562a8e010550102f27cc35f9f72b9a186066f96a0b84d022f654429d2bc
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10340 bytes
SHA-256: c455d43a716a5e449d1e9ab44f8f0d5d76cc42fcdfce5ee6a522fddb087be5f0
font_02_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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