Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ae1ceefb3427ad…

MALICIOUS

PDF

69.9 KB Created: 2021-01-02 15:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3107459a9224277f7e52a16ba234bd2d SHA-1: e9ad06ac0038040c46d630edd154b3743897de43 SHA-256: 15ae1ceefb3427adddce2f20c38f883cb139fc6a1c220eec631b410b9f34d817
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffe.ru/123?utm_term=vocabulary+from+latin+and+greek+roots+unit+16+answers', is directly embedded and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=vocabulary+from+latin+and+greek+roots+unit+16+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f884c7b8db93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb72d797e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f9bc762b8f7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fbed85d21912.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/nozuwo-zexagopobok-dudege.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/5313594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_5fd12baacca80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5f96cf2d6524c.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/vuniwufigunurur_xolifizijejine.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/zewimu/22838196053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f3b210-6393-4567-ab73-a066729d31cd/vabukejim.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_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 5908 bytes
SHA-256: b6e56f082b893360cb88358ace5e7a2072b56605eca196d755c3c825edca0341
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 13976 bytes
SHA-256: 2602ac90b49920712ac360d6b81e77c124429afdde416ccbe8337051831b1727

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