Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85c9dd7ef90757…

MALICIOUS

PDF

93.0 KB Created: 2021-02-16 23:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d501203479d1260c6839596973084e9c SHA-1: 254eba7b9bcccba62bd74d974efc70ad40404404 SHA-256: 4b85c9dd7ef90757702ada3cd74d942374967376c54fcd54d9acd1e9b0a63650
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://seumenha.ru/strik?utm_term=visual+basic+excel+2007+tutorial+pdf', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=visual+basic+excel+2007+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470029/normal_602608fc33af8.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/D4bFFjg/91083254071.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/ggWggja/82328646699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff54d13de2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_6022eaac1dd6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/qeib6hc/cold_process_soap_ingredients_label.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/ghigzhb/masodurijuwafasokekir.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/id2Jgce/music_visualizer_maker_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzikewed/hR9ihpv/65288962952.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/vhipNwZ/36732782883.pdfIn PDF document text
    • http://padlamadla.site/german_verbsng3e9.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jggxshb/frog_golf_head_covers.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/wusigipufuvowix/vertical_navbar_bootstrap_templates.pdfIn PDF document text
    • http://nogobixa.epizy.com/51600967354.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/create_checklist_template_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/9081395678.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_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 5676 bytes
SHA-256: c81c7702c0eb2ca9f42e5e5e1fa1c9a52809ca8d94f9420660a153bb31a696f1
font_01_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 10780 bytes
SHA-256: f06b27dd9f541278fe546b0893da87d5e930947f7f6a8d066c88ac0f7cfb797c

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