Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f32b02f93f03a3…

MALICIOUS

PDF

59.3 KB Created: 2020-11-18 03:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15354e8b52632bea508007a9fa5bc8e4 SHA-1: 1cf7198a92c59b106e4c6eaaefff0bcd56bb1878 SHA-256: 27f32b02f93f03a394b96889ef224dfe939384d1bfcfa96483e2a1ae26293440
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=they+call+him+cake
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5faeb6c90ad9f.pdf
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5f9d3caa43522.pdf
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fabb1e38d7b3.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fa7c85cd985a.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fa956aa94e53.pdf
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5fa15b465a2e7.pdf
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5f9d582c72280.pdf
    • https://bexatebipedo.weebly.com/uploads/1/3/4/6/134631237/gikilid-rumopi-vejob.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f9e572964c5c.pdf
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/7b75c5e65c.pdf
    • https://rugotegejobaxus.weebly.com/uploads/1/3/4/7/134734811/gipugexolesor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lefemijip/42113034819.pdf
    • https://s3.amazonaws.com/susopuzupure/bitmap_books_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adbc.bin
afa951e74bafba57f9c7b73c728e290e029fef32831de96c8ef237cd4eebc4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xADBC 4880 bytes
font_01_sfnt_off0000be37.bin
67afc088e9ab5c60c41b87257d1ca03f8756c6a9aee7963bc3adea72f4296951
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 10240 bytes