Malicious PDF — malware analysis report

Static analysis result for SHA-256 616c7dc4edfaa0c5…

MALICIOUS

PDF

78.1 KB Created: 2020-12-20 23:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 98fb2688306a1ca5af167f719373af88 SHA-1: 748840244e0cec85a3e1bd8ed144af0962ef253d SHA-256: 616c7dc4edfaa0c5eb0aa1dd7727acc5896cb9c8d9c0673e7f6ae1544eb5a008
164 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external URLs, a common technique for distributing malware or directing users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic further support this assessment, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=download+fly+jay+ft+daev+jungle+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5fb769d856f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5f9fb39a8f8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fbcbc590d915.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/pesipukix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5fb5b378ce8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_5fa43c78725f1.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/5fdd3a932dcd53187f1eaf8b/t/5fdd7693892c8943b097e6cb/1608349334663/8287389145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025f88e2-fd18-4c6b-9800-2cf3d747c18c/22645534366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022e82d3-bc7e-43b6-ab2c-c30eacfe9d35/3824758639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83efe7c-547f-4a8a-a6f3-dd7ef3b4dffa/xuzexizebesikusivigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71187a54-da25-4092-9b94-e15a2c4e38eb/movies_like_house_on_the_rocks.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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5580 bytes
SHA-256: 6ce582939b58d2102acc584046baca3763a9254b6b6385ebd3188e047b9c8983
font_02_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10568 bytes
SHA-256: 5a147c79fb9a98629b94e9592737f4b681cd5965ddd76b5895c17e698a68864e

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