Malicious PDF — malware analysis report

Static analysis result for SHA-256 86598883725b6127…

MALICIOUS

PDF

69.2 KB Created: 2020-11-23 14:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 44de36fd293fb768bdc465f3f7b15a29 SHA-1: 7139a4e04ef6fe8d805f89450e6aa556fcd6ba13 SHA-256: 86598883725b61273b200957a8b13adff8196d8f27c609f42c3fcb737b47cca7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics for linking to known malicious redirector infrastructure and for containing a link farm. The embedded URLs, particularly the one pointing to 'cctraff.ru', are indicative of a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=the+norton+anthology+of+theory+and+criticism+ebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5fb04481ae8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f92053bbc3d0.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/jobeg.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1d44b872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f971a3ed8093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fa7bf49a88e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5fa0deef32d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fad2cd7bbbc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f90eb0b3fd4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f9f7a4031790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fab533c62d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fa7adb0c2e89.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/79fb50cd-78fc-4175-94fd-4601bb96e423/67772291152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c8074b-d893-4e7c-b6da-9b4123be0cec/71253415153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6df9777-1ea6-4bcf-a3aa-a2343c3dfc68/51170438453.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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 5688 bytes
SHA-256: 976bf9834ce0a5e7f0e321798322f9b8d2136e7163d27793da84a7f7406f8e80
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 10496 bytes
SHA-256: 8de00d32c938c68f7b9004be0333cdf7555e68becdd1a689d05274f6cf4c3e77

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