Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c389c1bbb594b3d…

MALICIOUS

PDF

65.6 KB Created: 2020-12-22 21:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d2bf38941be4aa614ffe198994d54bb4 SHA-1: b61925cbadb445080114790e5bfd740430f8b23a SHA-256: 7c389c1bbb594b3dd2688b00ef40408b246d2a339859bc4ef47933c95cd90b34
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a link farm. The document contains numerous embedded URLs, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=santorini+architecture+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8716dc7bc67.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/6724fb451f3ee51.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/bimititifez-lewutiwanib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fb56b8134853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fc7ac7a6f043.pdfIn PDF document text
    • https://numiduramar.weebly.com/uploads/1/3/4/5/134595515/944324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa01f28-f777-46c5-b351-5ce2451161d1/metex_m-3610_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5bea08-6d5c-4352-9a64-23f8899e7c1e/zekedofuvum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51c18a8793968642360ab/t/5fd68b10ab77727176956380/1607895825000/binary_domain_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c9900c-767d-4449-8340-27883c939a45/29997545998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5e5c8b-aac1-408d-90f6-c8496610b120/79992982480.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_off0000c61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 5136 bytes
SHA-256: 96157227bb4fc8cd4efa0922eb98a0e90cf8121a9ba72e2b7747dbbfae72382b
font_01_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 10248 bytes
SHA-256: eba27d27f6942c6f93f79b97c5e5dec332d019182580e9255cd00863e4b7e93a

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