Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb06b188dde7d50d…

MALICIOUS

PDF

76.1 KB Created: 2021-05-27 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b7e18f91b4b166240d9139559b7df300 SHA-1: cef750a082b9aac96484c55de379cab08695e052 SHA-256: cb06b188dde7d50dd144774b11bb4d12cc8247b1076403c9d365f2c5c6f15cb1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous URLs indicates a phishing or content-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=school+uniforms+are+not+necessary+debate PDF link annotation
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/9013898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_600773af64b2c.pdfIn PDF document text
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/megevir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6048f0a2ac477.pdfIn PDF document text
    • https://gekuxufetog.weebly.com/uploads/1/3/1/3/131384115/0803f301b779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418556/normal_5fff5cbd2abab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_60028cb930198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6032c13661ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_5fd7f2a7569b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5fe22511853ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_5fd3570079e9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5ffc0ebbad48c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_60010c32be380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_605d6c1d024d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_604a92f06296b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480397/normal_6000d0ad16ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60174dd621ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_601130d3e7275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_60650e53db565.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/7e86dd7c-8205-4eaf-9303-48910d9d4cbd/where_can_i_get_a_customs_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6323b799-7ecd-4715-84af-b337b5ffcdae/how_to_fix_sony_cyber_shot_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55648e07-b121-4418-b7e1-18cba425df86/napufipoloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e60367d-2e31-461b-b03e-90a86a783d0b/ozark_trail_600_lumen_rechargeable_led_spotlight_instructions.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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5604 bytes
SHA-256: 175b2bc518e7e716958b9c12d27bc0b1d0ae07bba22d89bb3430164345aee12c
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10632 bytes
SHA-256: c3049bf2feb697ab9169ceb1a469ae8f696c3bae13d48431b5abb98db0ec324b

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