Malicious PDF — malware analysis report

Static analysis result for SHA-256 924767b1e8e0d07e…

MALICIOUS

PDF

73.2 KB Created: 2020-11-13 06:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a01f8235f518412e4c91e361e1f5c791 SHA-1: 7a31a12c3950413fab90a783ec9fefa7dbb335c7 SHA-256: 924767b1e8e0d07e0fa63ab1de9c2972a6765d1b2a7db3145d0a512264f6e754
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used for initial access via spearphishing.

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://trafficel.ru/123?utm_term=guild+wars+2+mesmer+armor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5f9242d06b5b3.pdfIn PDF document text
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/9741606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fa253a4d1723.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/wakelakofo_guzazaw.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/611001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_5fa8f3ba921a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8d56126ef0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5f93945982f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f87210ee0246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5fa4bf208baa2.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/fec85a3c-1da8-4a93-b2f3-dff60922da41/webesoxivebinowojetav.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/examples_of_cash_flow_statement.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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 5228 bytes
SHA-256: cf183dcb686a8fb3ffb1ac2e78b01fbe234418ba52c1dd44ff37947ed211e7de
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10516 bytes
SHA-256: d63b1483f5f327fb117ecf0db0e36799f29df50b904745fe961158cef4a319f2

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