Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c41714310d7291…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 03:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 822a11a2c8f7a835e90dd02647f4969c SHA-1: d93ef01eba9019951b694d258bb5a7c641af9652 SHA-256: e6c41714310d7291ea729096f5e1088252d839845c4209bd18d2aeb74c3cbdff
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly exploiting PDF vulnerabilities or using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=what+is+career+readiness+certificate PDF link annotation
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/kivosefomebub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6011e417b3885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412391/normal_5ff901de2a7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_603ce9f60e6bf.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/20eaa16117ee377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5ffaae39e5463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6026d26126990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5ff6ad592f822.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/iahiijl/55735310320.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/banegugowixelobadalapika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff3031e9816b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6025c1170d3ab.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/32874133854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/zifudubojufowerewofaxuj.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 5088 bytes
SHA-256: 5b45569306b05f6e0a6b727de3ce62a7c6238353ab05a03eedb9558a6081ac42
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10640 bytes
SHA-256: 56d4272500a50391e9e9881f0b7c8ce973f1ce93e701ea167f2d6989bfeea86f

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