Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9adcc5bf9cad65…

MALICIOUS

PDF

111.9 KB Created: 2021-05-03 00:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b25a0cbe74e3c185895c8cf69ba55e24 SHA-1: 76a48244dfb78da4152e6a741447640d768d50e9 SHA-256: 4c9adcc5bf9cad65cf55405c841470932763a9a9ce7b06e8e0f9f43e9fa04620
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what%2527s+the+mechanical+process+of+breathing PDF link annotation
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/5026837.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/303142.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/m5fheij/zokakutugatufawinivifuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff01b69d38fc.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jbHiehb/accident_reporting_centre_toronto_locations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fdc200f6f12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_604d99b290eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_6001a9800439c.pdfIn PDF document text
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/6638244.pdfIn PDF document text
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/1a2f5c53fc56d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ff0a4dee2cc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_1c6466cacf6a4d0f8a02df5a7c33a2b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be795fc1-51b4-400d-9774-87031499ca3d/83252341555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abab0e24-a27f-4a97-8496-844af0c49095/collecting_like_terms_with_powers_worksheet_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f45249-8ab1-4cc6-b604-a94572b6790b/7959983172.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_c27b0130894a4f93ae2597705da61960.pdf?index=trueIn 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_off00017834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17834 5616 bytes
SHA-256: 4157e651c2860846c7a80941cdec80a3061300032c35b74950d957db89652775
font_01_sfnt_off00018b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3C 11836 bytes
SHA-256: 57a3b68db0d90ce56518d0096d92fe1f9af2d99d8d0f8e5e4d0c080b3f0f55ba

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