Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f279e7924aec97…

MALICIOUS

PDF

69.9 KB Created: 2021-02-09 06:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fca40343b62df64ab0eecddf6c09c8fd SHA-1: b1974fd1868c6ea58d1a9c956cc6eea34ab72c76 SHA-256: 20f279e7924aec975f386060eb02a3c3bb4bfbf4927520f2feff6c6a370aa89d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and a high ML score indicating malicious intent. The primary URL suggests a lure for a modded application, likely a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/aws?utm_term=balance+ball+3d+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481162/normal_6021bb969b41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fe6a7c2a3c26.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/ibE0hcT/86155754909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5ffdb35c23446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fcbad4fd4394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_6013e67edd774.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/nZj1uii/lafuxuroxarenevusoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5ffdd7ea663ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/WLqgifJ/81540835954.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/33214127853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fcc1c38b841b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_6021c3c249f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fe88d3c4e85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6011e4afd0e35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamutazuzores.epizy.com/49322325950.pdfIn PDF document text
    • http://bobujosu.epizy.com/biochemistry_test_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/appendix_format_sample.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/65454520364.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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 5360 bytes
SHA-256: e7f7d6b026925c79e83fc3f58be65f9e700e84e899efba16d761694c1d03ee00
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 10932 bytes
SHA-256: 2e012ac38b6fa3ba37554baddf07e8313399b5e541e9674c2c9f6af55b31f136

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