Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01e77468c93c271…

MALICIOUS

PDF

65.7 KB Created: 2020-11-20 05:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d46bec9a1aab7ba9c114de0390e5556 SHA-1: 8b45a5ffc9ebd12b35cbf1b81bf77b74e511b1e5 SHA-256: c01e77468c93c271254cedf8f95a57f200b31e5230d4e02cc972bd9cae1c389d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lead the user to external, potentially harmful, content.

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
  • 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.
  • 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.
  • 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://traffine.ru/123?utm_term=what+is+siopao+sauce In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5f97711fac7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f9a436fe2df1.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/2606443.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/nuwakisu.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/6a546ab710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f871cbe25563.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/funofagib-narawatipasiso-nosorebimurigo-kibozaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fa98df7d87a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5fb264f92d51b.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/c19ab.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/zazelujeju/d_d_5e_guide_to_feats.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/megijabirogiveranafami.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/firmware_file_software.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/hypospadias_surgery_an_illustrated_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/26785453342.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_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 4904 bytes
SHA-256: 7fde02f2b4521e3c225db8a63898c9c93fd734d4b78f5782f17f8828cb580e00
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10048 bytes
SHA-256: d5a37754ab721d0811e5242fe25dd3ba20acb564a48ae1c9370170d9f82d78ac

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