Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d3f831bd813542…

MALICIOUS

PDF

69.9 KB Created: 2020-12-25 06:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c317efe6a92c6da4f24215b379ff490 SHA-1: c7c27076a8f9ff58890702a86d0613136add1481 SHA-256: 36d3f831bd8135426980eb7e990ca791abb598dfe6fbc987402dfc0dd278aa39
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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
  • 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://traffset.ru/aws?utm_term=hip+abductor+stretches+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5faa69b5903c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_5fd70a57e8d8f.pdfIn PDF document text
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/suwumaviboladagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fbbe7ee15f31.pdfIn PDF document text
    • https://xizuxukavawot.weebly.com/uploads/1/3/4/3/134376570/wedekunalixoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f966a3e1f210.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/84b6c0d3-5245-47a0-898f-78aa9e590514/36928973636.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/39502047415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c72dcc-9f28-4f86-9148-3b00f75a87b4/99349444712.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/a_doll_s_house_character_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544d97c5-cdc9-4c46-8bc0-dc0206214475/kukilosok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c53fb91-0246-47c7-bfc8-7684253b13e3/zavetanofoperor.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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 5312 bytes
SHA-256: ce09765dd8cf03bb976dedafdf6ae2fd39c61f9ecbbf9bc62da47e577a13f8d5
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10376 bytes
SHA-256: ca3a0453bdfe8fc3730b81c9eeef2d35c66f83f8796d4bb0d3ec1586a1a282ea

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