Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8f7373be98ec8b…

MALICIOUS

PDF

87.2 KB Created: 2020-12-06 06:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 22d401382a1de80e99670dd68ce0acbe SHA-1: bd4924cb26f05dad9275562a9501cad711c3c395 SHA-256: ea8f7373be98ec8ba3a1ea8a62e0e8fa41e546d90dc83beb3889c8f4ef8b07a0
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://cctraff.ru/strik?utm_term=how+to+kill+a+wendigo+supernatural'. This URL is likely used to redirect the user to a phishing page or a malware download site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

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://cctraff.ru/strik?utm_term=how+to+kill+a+wendigo+supernatural In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fb003ab69999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8e0a3d9f946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5fbcf98219808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5f9fdfe334ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f91914f84f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fb4484605a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f9cd10526ecd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/bruchrechnung_addition_subtraktion.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/581361958.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/properties_of_rational_numbers_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14748c89e1c4b8fc0f61a/t/5fc46d5f173fb5383b316b2f/1606708576342/bankiet_forum_bhw.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/transformations_practice_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba12df132613bbde966f/t/5fc7784c1d106d256bc43314/1606907981525/mukiwuvekikejof.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/vedururidiru.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_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 5244 bytes
SHA-256: 727995ddd7d114522938ec7575a9763d1d04472e0d03e503511faa8f4485e928
font_01_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 12708 bytes
SHA-256: b2f13bacd1d6b1f35fac70fcbfbbdabcc68cd93d571e739fcdce3f53b788d248

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