Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd3aab7fd4d323b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-24 01:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 552fe4cf76174f519c94f66dafbff61a SHA-1: 203bab0ec534969f57e1941cd92fe252d77f36dd SHA-256: ccd3aab7fd4d323bd5fea67d4bb774f74372aca8a9474992a39a8aa910edcb73
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=greek+and+latin+root+words+for+gress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472501/normal_60289470339aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_5ff4c41b52e3f.pdfIn PDF document text
    • http://rukafuxofi.iblogger.org/blu-ray_sony_bdp-s1500_manual_en_espaol.pdfIn PDF document text
    • http://goduvide.22web.org/gamopenakusiwojonip.pdfIn PDF document text
    • http://sotovezi.22web.org/copenhagen_airports_denmark_aps_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_600d6c1380faa.pdfIn PDF document text
    • http://gemomubogobupo.22web.org/71744741981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_60067af92cbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_601fb11f8376a.pdfIn PDF document text
    • http://tikenifoziv.22web.org/free_annual_equifax_credit_report_and_score.pdfIn PDF document text
    • http://budonap.iblogger.org/page_keeley_probes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fc9a23a5cb51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwivesunita.epizy.com/zusotilujora.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/dilidedemufepiv.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/82677505216.pdfIn PDF document text
    • http://fepaxediv.rf.gd/powerflex_525_ethernet_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/vubesilik.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/event_budget_template_in_excel.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 5260 bytes
SHA-256: c8cf69af0ca5f8444f73635cb27af31e6c455638ba016cae89499a42520f91ed
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10276 bytes
SHA-256: 4a2f2b672923233e8586c3cf893b8637fa856bfd36f35a12455879af15b5a899

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