Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c4c4264a29f444…

MALICIOUS

PDF

76.5 KB Created: 2020-11-11 21:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be84afe9e2b9c29bc064de545d045afb SHA-1: 30480a664821b3394c819c5e88f26738eaca3fd0 SHA-256: 23c4c4264a29f444d1a4f595c8a8baa111ff9b3522ba277249dceecb7644071d
214 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. One URL points to known malicious redirector infrastructure, and another heuristic indicates a PDF link farm. These findings suggest the PDF is designed to lure users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=destiny+child+gear+guide In PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/3242869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5f96c90deebf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5f98f343ae07a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f8baf87604c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f975eaa91e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5f979cde1dc0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f9614e1b8871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5fa2716c280e2.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/muruxatoxofefugopoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_5f95dda01b057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fa2ae61f0c56.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/zosevid/vofuxigasax.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/mag_guide_pso.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5300 bytes
SHA-256: 9544a274f654c54a62a2f5cb3a471b7a5018276cfb4e7caaba22d782e385a733
font_01_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10700 bytes
SHA-256: 8c33d049bb281efd61afcbbcf1c58800220e04af9cdecf1a3ecf550c583e0cf8

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