Malicious PDF — malware analysis report

Static analysis result for SHA-256 6866781fb34761e8…

MALICIOUS

PDF

67.7 KB Created: 2020-12-22 06:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7078a53ca724702be86934c8b85eee7c SHA-1: dfae6287d9c7f9ef0034a3b7031299118bdfb043 SHA-256: 6866781fb34761e8fb0432a6f6fd8b92c50a197b8e33ead49a6d59e716d6d786
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site that appears to be a link farm or distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware download site. No scripts were extracted, but the PDF structure itself is used to host and promote these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=bts+fake+video+call+prank+your+friends
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/vovas.pdf
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/6701704.pdf
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5fa52e81a22da.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd61008c8b18.pdf
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5f953e14c465b.pdf
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fe127983fc74.pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fc10352e18c5c478e1fcb5b/1606484820083/geometry_chapter_9_test_form_a.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1ef8507f735bdd7482f4/1606229755454/nightmare_before_christmas_ring_holder.pdf
    • https://static1.squarespace.com/static/5fc12947bf71053ccb11d3e8/t/5fc79b912ac13f1ee9c06392/1606917012622/rivals_at_war_hack_apk_download.pdf
    • https://static1.squarespace.com/static/5fc5a5fdf9866f3fd2f44310/t/5fca6c9e82de7b4d638e397c/1607101601541/zepaxuni.pdf
    • https://static1.squarespace.com/static/5fc79a43c89b935f15e314ea/t/5fce89b542bb946bd948fa0b/1607371190363/jifuzodim.pdf
    • https://static1.squarespace.com/static/5fdd2b976394b41d6424bdfb/t/5fdd5f4b5809ae3434e4d1a7/1608343374332/60422690261.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac8.bin
8c9b527255410dc5d7d13ba2fd64320c508439bd474dc2f700e7193dd0d7a316		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 5424 bytes
font_01_sfnt_off0000dd61.bin
4a338108c838fc502aca6530131e073f23c6f963e685adc88b0a42df9824d9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10752 bytes

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