Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08bedeb55067cd2…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84ee6493f5574e2026c797d1b1c0ccb0 SHA-1: 8059412f25bb8696b7ee544197753e55dae029ef SHA-256: b08bedeb55067cd2d269ae6e9d79c3bc6eeca8126e74daf8ef103935e059d514
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or a method to distribute further malicious content. The presence of a malformed exploit stream and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The embedded URL 'https://coretry.ru/pbw?utm_term=aide+pdf+to+dwg+converter+12.0+registration+code' likely serves as a lure or a redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coretry.ru/pbw?utm_term=aide+pdf+to+dwg+converter+12.0+registration+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379485/normal_601731d4f3fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fdf29fa88c4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_5fccf89a5f6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_60586314c6971.pdfIn PDF document text
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/temakolexisomagolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5fe3699405cc4.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/dokukifadox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_602adbf00a4e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5ffba2989824a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_604a77f22c8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6054407ed77fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_600ecaba5bd47.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/135691a0-ca36-4dde-b7d9-4edbc528bb58/toefl_independent_speaking_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe881541-da75-4e07-b06d-07ff830da585/brene_brown_vulnerability_ted_talk_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceec1208-32e5-4323-8014-7ee0c33dae06/bojurodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79c26f8-2f72-4b26-a535-283ad601d099/cantos_domingo_de_ramos_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aede294d-dd4a-4d96-925f-7c4064bd7656/92889070441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156f893d-431d-4156-8f04-75c399281a26/famanozuluzugujorudik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2840bab4-d8ad-4107-92c3-0c1a4b8c4145/end_of_module_assessment_task_5.3_answer_key.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5792 bytes
SHA-256: ec85fee8832eeedce3d5426171a12baf5876ec1fc65e1460b8bc2970da9a21f6
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 11168 bytes
SHA-256: c76b3f4a3fe78fd0708b91be5cbc896afb7c5f88dcba74ff13f39422d297ba5e

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