Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20bc7785f8ee4f2…

MALICIOUS

PDF

73.0 KB Created: 2020-11-24 06:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d99083d75b23f97fea9b7d5ba2f3669f SHA-1: eefa284c2ed55021021e428408739bbb5f6ad66a SHA-256: a20bc7785f8ee4f280ff0f5ed007cd52006659aa1af185e1235bc09a12589223
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. The document body, though heavily obfuscated, appears to contain metadata related to its creation, further indicating it's not a legitimate document.

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://traffset.ru/strik?utm_term=problemas+razonados+para+preescolar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5fad136c0ee16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f906e9fae15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fa19c9398e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f9279ca70ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5f9b940a52622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fabee7e83226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5fa026c78586f.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/gupuso/52714728113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d836b8-c50d-4031-b580-c4499993614f/36583950986.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/fuwimexujovipifuwuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/81793149927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ec60d5-e6b2-46da-b9d5-33b33bfc1474/lutibulujul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8c1645-44d0-4858-a3fa-f6f8fdb99bd8/sosanalera.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/tuxinonajulofamurixot.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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5412 bytes
SHA-256: d78959951bce29fcd1913b50ffebaf3086c455f3bc6bf9781ddadeb34de2e1a6
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 11620 bytes
SHA-256: 482cd9e4e55883a96d9f4bf3523a2591e4259219fb7b5dff1241555d05715304

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