Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d432149b18b682…

MALICIOUS

PDF

70.2 KB Created: 2021-03-03 01:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9f65fe90317b82a5f4cf98015c34c34 SHA-1: 481214e6e0693650f8230935f011fe1a692f0a6a SHA-256: 57d432149b18b682d038a395245d00ef91e6f64eb7c259db1aef5a1a7e8be996
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/strik?utm_term=are+all+gt500+manual PDF link annotation
    • http://sepukolobu.sportsontheweb.net/99995904035.pdfIn PDF document text
    • http://hesap-al-sat.com/26650926103ngm1q.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/15394500609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_600d8eb819657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_6024bc5e8fbee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/drug_information_handbook_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/dabegojuwivupomagajiserog.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/vokamusasuzineguzomozaxi.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/piwufagipebupux.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/athens_underground_map.pdfIn PDF document text
    • http://xemugapot.rf.gd/kenmore_110_washer_parts_manual.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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 5080 bytes
SHA-256: 188862d4d02caaf62a4db7d8853e505a62a2fd74c1b97d8c21b3ec0612aaafb3
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 10552 bytes
SHA-256: 1d610cff1cfd9e47ddbd7fced4b38975c8c7af08aa2a1d3ddbb9c255a9753cf1

Open this report in the interactive analyzer, or submit your own file for analysis.