Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0016c18c861481b…

MALICIOUS

PDF

67.6 KB Created: 2020-12-06 21:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 54328481d4c6ce9901880bd5888c8bd5 SHA-1: ef188fa4a66d472b0aee5f599dfa57b53a6badae SHA-256: f0016c18c861481b0ae3143cac8b1774806a166fb3e6a5ac87fc3d7c1ff803e4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wb?keyword=printable%20maths%20worksheets%20year%2010 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5f994af4986ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8fa2bb1c484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f93f9670b0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f915eeb3e04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8ed67bdeb40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fc0f3e21be69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9dd03b9257f.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/jofunozuzof/affinity_water_domestic_leak_allowance_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf544f61e25426e12f7ddb/1606374480279/rarazatuxejawebivedowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063c0eaa-5c67-4e6d-93fb-76a371587694/vebakokewezasolalefapep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e13a321-7b70-4675-ae80-66bacda2e58d/gewitajolesumeronexi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/fenapaza.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/85030417967.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cf2f8cdb769c6d9162e/1606372595221/reading_a_climate_map_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650bf9fb-4897-45db-b23a-5ca1cb246341/h-alvorix-rs880-uatx_motherboard_drivers.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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 5520 bytes
SHA-256: bd3ccd84053f78b63206f04685011cf5086bfea83b3d2e4dcc74f1fdb2149635
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 10408 bytes
SHA-256: 56da1765ddce8df3e89b17e3caf283c8c06d061e92c57f8ff414c95f68fcbbfe

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