Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e601a3960db79…

MALICIOUS

PDF

70.0 KB Created: 2020-11-14 14:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 500ffe624d033204aeb623d957802659 SHA-1: 9953b8b7d48412afbdfcf65fe8737e2f4f678712 SHA-256: b65e601a3960db79fb61b4145932d4a61fff53dc69c62efde1623d3124d21497
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various PDF documents and a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or link farming. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed 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=barcode+ean+13+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5f9a1f4294cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fa3a3b42b7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fad3c6f57e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8909bf80b68.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/9316107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f89b59f07746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f9eb7811d805.pdfIn PDF document text
    • https://tapenori.weebly.com/uploads/1/3/4/6/134657753/6327471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fa1e184ebca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5faaee25379ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_5fad582ec37cf.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/d9500cb4-140b-4806-bfdb-f52ba2e9e8c9/zobezefokikivan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6c3417-fb61-47d6-b761-84fbb2000f0e/cursed_treasure_3_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b2b9a4-f24e-494d-a2cb-d79cbd2a7b74/54110938795.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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 5224 bytes
SHA-256: bc6c1f4bc316c94924dd331ca9d8a94670310c47120f73ee4f0ebc365e0c3807
font_01_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 10184 bytes
SHA-256: 1c1f9fed7e1373b95b575a683b0b8fd55a4d1dd9cc103ed6ff402aedcc323afa

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