Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24a76b434e23095…

MALICIOUS

PDF

91.7 KB Created: 2020-12-26 16:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d46f1ccc596ab687038892add91fc5f2 SHA-1: 7667d379fe10f5e604a997a55f0dc202ee35e3fb SHA-256: f24a76b434e2309548fbc0e50dbb9eb320c91f42b2df50bf6d04c83bc0132004
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to academic content.

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
  • 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://trafffe.ru/123?utm_term=kuta+software+infinite+calculus+rolle%2527s+theorem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469105/normal_5fbeb00b6d79a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff59ce4-90d8-43be-bf9c-a6402a9192ce/ludurinugatusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c39a5ab-9570-4f7c-bbef-345230fb481d/97491259222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5000ea-f8c4-49b4-b965-0aec56b92869/fepezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17816483-8e72-47d9-918f-c2b8c258d13a/trial_balance_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7d1b1a-e9ba-42a3-8570-e8f948623a99/wuzomafurigagowoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6034d009-cd0e-4b0d-adc9-3fb99673bce2/pokiromutitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded17502-8adc-4209-b41e-c8574a1fe6f0/mudavigaloz.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/factores_de_riesgo_para_atonia_uterina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b62137-451f-4f62-8643-4f6be904c803/obrien_water_carpet_grommet_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/wobukijibulegibakofadubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3adc75-00b0-4d35-bc81-fac815cc0a99/14874288708.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 5216 bytes
SHA-256: c9382c3bcb86e7f08817bb7cc14516338868b552cc822d09391af52e87997515
font_01_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11292 bytes
SHA-256: a766235d93094500622d462d035c4c993345c655fa4442a7964d4be4d7e9da4a
font_02_sfnt_off00014c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8E 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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