Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cb03d96fd77659…

MALICIOUS

PDF

74.5 KB Created: 2020-11-19 04:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5d29a79f38b35830bcd6be69f6d474cd SHA-1: 537e3db1cdbf5e6febb6593218f09377462b447e SHA-256: 04cb03d96fd776592c2c74c19c36bc4c827cdb0ef73597fd5126c7c29e76faa4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the PDF structure itself is weaponized to lure users to malicious sites.

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://gettraff.ru/123?utm_term=heaven%2527s+lost+property+characters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5f9435dd4eb4b.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/biride.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5f9c34c88de51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8b59988e0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f953a79bdc24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f9d1490de586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5faf84d3a1a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5faf64994bd09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9b11a37c-b83d-44e9-8263-11686591ff24/77998325284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023bb176-2832-4114-ae8c-da8598ec9584/37486287067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db527c40-2c28-43ff-999b-7ca2e2c79704/geometry_chapter_1_resource_book_lesson_1.1_practice_c_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789051b7-461c-4e8a-9feb-0fb1e51ca69e/22587131603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb4778e-053b-4f27-a57a-988565d9a30d/49757735774.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 4916 bytes
SHA-256: 36c0700875cd57d0da09d84210b446ecc14f4794a210680e26620b9c7e140b8e
font_01_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 10364 bytes
SHA-256: bdd929231551b617553736ad81c1b59bbdf301f183ee5c0c44a942265f0a50fa
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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