Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dccf9e896288ae…

MALICIOUS

PDF

76.7 KB Created: 2021-05-23 10:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b61fbfa1d5db31c8e788c20bba377891 SHA-1: 2ef2042bb54330cdb8cc2356cd58b3a019bb0498 SHA-256: c0dccf9e896288aeca75a8fed6576db8f9b4183d77fdf0eec79d7eefeba9e142
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to direct users to malicious or SEO-spam sites. The ClamAV detection and ML classifier indicate malicious content. The embedded URL and the presence of a link to 'nipisod.ru' further support a phishing or malware distribution attempt.

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 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.
  • 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://nipisod.ru/strik?utm_term=amazonbasics+large+portable+bluetooth+speaker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601d9785e140e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_600fdd4128115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ff354c09ed0f.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/setubube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_60661897507ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fceeb317c85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_606ac1c76e6c5.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/famoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_601b50487bf31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_6032e31359129.pdfIn PDF document text
    • https://butemupow.weebly.com/uploads/1/3/5/3/135338881/1180396.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/6d51bd727976895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/nuladojefinate.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/where_do_i_find_the_model_number_on_my_maytag_stove.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/step_down_transformer_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/64031967338.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/handoff_report_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/real_estate_closing_statement_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/93992662267.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5592 bytes
SHA-256: 83a59ff02f014f1040ed1cd6540fb33452b703ad8cae185747c3e59966a035c7
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10848 bytes
SHA-256: b19161bd0e61bca2664d875e87ea04dbdad017e2fcf22807b61a5c7239212317

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