Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c498b71cd4b8a8…

MALICIOUS

PDF

67.0 KB Created: 2020-12-10 10:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c55a222ccfdd5b91dba85594d38f071 SHA-1: 1cedaec82e6110a5a2873fd450934aca440cbe4a SHA-256: 67c498b71cd4b8a86ee820cb3dd456a21f2fb4f31f4652b19675749f7ee261a5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/123?utm_term=the+complete+guide+to+aromatherapy+third+edition'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

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/123?utm_term=the+complete+guide+to+aromatherapy+third+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f89a4384bcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_5fc1d4894e999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fa9767bcd60c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc395d1c6229360ecbdc211/t/5fcd512f1e1a4d7de13a82f5/1607291185225/metronome_beats_app_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf65c08845d09244fbd3c/1606284896763/fazugisomalopikobirenorir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59b8916f6d44b07de8fd3/t/5fc621a84f98375720b086d9/1606820265955/niser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48383aab-38ec-410e-8556-aeb9ae230638/dobiroxozeravasok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dd2ccd-9867-4985-b574-fa6b4574f3c2/77041130523.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5178a97599144eee07bd/1606373753269/81531052586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b7c07a-0915-4044-9339-6f382e7f846b/79972697139.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf65bb4c4d833b8bcfced/1606219357214/zupizumokubipatiwinumiwe.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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 5360 bytes
SHA-256: 9ee1a1664f8796d99b6f4e64c380fba66c0955118f101bd0adc996ec2defa4c9
font_01_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 10292 bytes
SHA-256: 92ff80c39c46ffa52e5a14c346b9929e92931b1246234bed7226ec1d0d4157d6

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