Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6590b3d4ba85a0e…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 01:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aba2c60a0c8aaca77c2f3b29b99ce873 SHA-1: 209dfdaa56cdd46ea116055de73c55b59d2af2b6 SHA-256: e6590b3d4ba85a0e17cb41dd2807a6356c2e0a1df13c94587e52d19464d76cd8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/strik?utm_term=best+used+automatic+car+under+2+000 PDF link annotation
    • http://prizyivnik.ru/significado_de_tabla_peridica_en_ciencias_naturales2cpuj.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/gumutewifubeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/gijaSPS/25661706490.pdfIn PDF document text
    • http://italystore.pro/2006_kawasaki_bayou_250_specsfaiub.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/sozipasorupebibaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rijolumexeb/qvTihha/press_your_luck_2020_episode_1.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/1040138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fee26e5db8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fe251a1240cc.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/pegufodotokuxenojor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5fceed2e36e4f.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/is_acres_of_diamonds_a_true_storyt1q59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_600cc2bb36108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_143d57a88f964d588787d3aff93a627b.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_7adc6b89fc5740c0907415c96cb65ecc.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5376 bytes
SHA-256: ed825a27914e24fb18e50ff5832e7ec38d9323758245fb38f12945b413b7aa35
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 11268 bytes
SHA-256: ed8fe90f3a3ab851113701ba6ece8e39bfaac7c1e6b3f05d6aae379d471165e5

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