Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46d4b09c959423c…

MALICIOUS

PDF

67.9 KB Created: 2021-02-08 10:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bb32b74458ae2e4a0495e129f366c97f SHA-1: 266d85a77c9eaa744a69a3a036e07ff64fb50ba8 SHA-256: d46d4b09c959423c54a682b8ae31c380da44309b186ece492982c4e8284a089e
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The document body, though partially garbled, includes text related to 'Uchicago class schedule 2020', suggesting a lure to entice users to click the malicious URL. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=uchicago+class+schedule+2020 In PDF document text
    • https://dibusolig.weebly.com/uploads/1/3/4/0/134096246/4147474.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/xKieqhi/39207730197.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/XV8n1og/como_descargar_geometry_dash_lite_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601e0a9411c62.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/POjnsgh/halloween_costumes_ideas_2020_men.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_5fe74b70ef392.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/jddghOM/dragon_armor_models_1_35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd64a9451835.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/dofufiri/cch_prosystem_fx_scan_user_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/vukolajikejemepavifuzuk.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/32521273714.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_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 5368 bytes
SHA-256: 9a9009fab8532ee4f6f6c3e906569d2d82141f9945a7e6bf93a8e3f2e10cce9b
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 11112 bytes
SHA-256: e6a05e202eae734c7e7977d5951aabd404064c64f9faabdd03803eaa5636c749

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