Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f282f8d4065beb…

MALICIOUS

PDF

66.2 KB Created: 2020-11-11 22:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a0fac37713a6889e554ffd29be4558ab SHA-1: 1ea9c82e89f01611f30561b1fe82407b78a888d2 SHA-256: 70f282f8d4065bebb66fcef2d90e3040cec75eeedbbb99af8d4e9da71179787f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect the user to potentially harmful sites.

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
  • 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://traffnew.ru/123?utm_term=how+to+roll+your+tongue+wikihow PDF link annotation
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/domugaputuvetafo.pdfIn PDF document text
    • https://mifojarodileg.weebly.com/uploads/1/3/4/7/134707921/bupowaluw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f89fe72c9383.pdfIn PDF document text
    • https://tojopuxibo.weebly.com/uploads/1/3/4/2/134265943/sutesogavabevi.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/49d7cfc252432fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f92794e9a76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9ab5f78a8ca.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/jepinebawo/rosario_domingo_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fac6e2-de39-4b94-bbd9-65f774c13960/73226230495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3979f0-306f-4129-9c5a-c45262327a8e/high_school_student_information_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/94220283400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c791f163-cd0b-42bb-a477-fb8dd6df0efd/articles_on_social_media_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42aad673-4529-4542-8aac-8e915d8d7065/kagatoxojuwa.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_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 4776 bytes
SHA-256: 44000b817bf4c3a0e6b5cc6c28cac0c105ae5b36492411ebd21204c80a928b7d
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10456 bytes
SHA-256: 549306f34d355bb31ad63c6f2a4dd3cb9a1efd00bd76b9381de319138710111b

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