Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2e4c5b5126a76c…

MALICIOUS

PDF

72.2 KB Created: 2020-12-26 01:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 712844fb64006af761cf90c6fbaf9fa6 SHA-1: 74e9e136ff70165f4b5cd31f9127f066e66fff26 SHA-256: bd2e4c5b5126a76cf391e88cf0197b95391a489f3b896c4ee368e1ca52455b68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as phishing. It contains numerous external links, with a primary focus on a URL leading to 'trafffe.ru', suggesting a link farm or redirection mechanism. The document's structure and the presence of embedded links indicate an attempt to direct users to potentially harmful websites, likely for malware distribution or phishing.

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://trafffe.ru/strik?utm_term=mcat+2021+dates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fe2315e76d59.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/nKmiejj/99165240867.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/596550.pdfIn PDF document text
    • https://didowivukosu.weebly.com/uploads/1/3/4/4/134470318/zugapurozuzedivoda.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/9acddcc5-fa0b-40c4-a459-7c6b963d213c/20618819484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8573b107-90f3-4320-8e60-2e5a6cb0b1eb/chapter_summary_for_a_thousand_acres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fc7b01-f361-4f9b-ab97-39aca4430d80/50601754981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596fe23c-c805-4463-a83f-50cfe8590584/starless_nymphomaniacs_paradise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf8c181-3563-422c-aea2-9c4fcd367bb5/mba_for_lawyers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f667050-0fec-4c74-a1dd-392c61cf57a9/pomes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17447115-3c40-40cc-9c3b-9b0ad7e51e52/pamilisujinolatoximinuzim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6092baa5-be0c-4a09-bf61-de08d302a326/20359692069.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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 4660 bytes
SHA-256: 681a3cec1b6e14180280bcb9bbccad62c3abcd57b92d251de8a18614797e1f6b
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 10664 bytes
SHA-256: 03596202d08db68fe04e4ce2fd307529578904b7c21ec7a8b8b006b290e946f0
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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