Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbaae7567bdd065…

MALICIOUS

PDF

93.9 KB Created: 2021-05-20 15:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cd1d77168b66d59c77421108118b4a5 SHA-1: e880cf7a52c232579a7c27c145434cf44f8fa84e SHA-256: bdbaae7567bdd065f9e73e2d5e4748a26004ea19b6a1c186af106f9add5e171d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to reference interview questions, suggesting a social engineering lure.

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://botokaw.ru/strik?utm_term=electrical+project+engineer+interview+questions
    • https://static.s123-cdn-static.com/uploads/4489979/normal_5fef104a87e52.pdf
    • https://static.s123-cdn-static.com/uploads/4402267/normal_5fc8e701475a7.pdf
    • https://cdn-cms.f-static.net/uploads/4421612/normal_604f861c36773.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gavexilatuvitaz/loan_agreement_template_free.pdf
    • https://uploads.strikinglycdn.com/files/265dbaa7-7ad2-4476-81e1-2cbcdf544e18/internal_combustion_engine_history.pdf
    • https://uploads.strikinglycdn.com/files/33624b64-1a87-48d5-b677-191ff764967a/concepto_de_investigacion_con_autores.pdf
    • https://uploads.strikinglycdn.com/files/022df37b-c403-44e9-b57a-e650e852d8bd/luvofutaweres.pdf
    • https://uploads.strikinglycdn.com/files/5f24fa1c-ef84-42dd-9616-923692249665/58913121733.pdf
    • https://uploads.strikinglycdn.com/files/348bb5cd-f41d-4627-b60a-875d70a54930/xuzawavegora.pdf
    • https://uploads.strikinglycdn.com/files/0cb9a5c0-0005-43f6-a6ae-41aecec9cdfb/how_to_be_an_emotionally_unavailable_parent.pdf
    • https://uploads.strikinglycdn.com/files/b8f4d987-0f4b-490a-8592-46096344bcb3/the_kite_runner_betrayal_and_redemption_essay.pdf
    • https://uploads.strikinglycdn.com/files/e592cb1b-0c84-419b-927f-82cde384d550/disolucion_normalidad_formula.pdf
    • https://uploads.strikinglycdn.com/files/e8eda1c0-f55e-4ab3-82d5-a636f953ab61/how_hard_is_the_general_ham_radio_test.pdf
    • https://uploads.strikinglycdn.com/files/5bedc5bb-2c60-4f5e-a851-18772b27b12a/what_is_project_management_salary.pdf
    • https://uploads.strikinglycdn.com/files/ffb6ed54-333c-40d4-8ddf-0bf1d745f7d7/24645745336.pdf
    • https://uploads.strikinglycdn.com/files/f36b9656-9687-41f0-ac45-92a25f7ba9e9/jonuja.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/visuo_drone_xs809w_manual.pdf
    • https://uploads.strikinglycdn.com/files/85e9699b-6df8-4fe3-a585-eedd8ae5c039/19146176809.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e8.bin
692f0b210a65fbe1c6df1f8a3e2ccaee56950bbb450cba3708646eb0b1f6fe7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 5296 bytes
font_01_sfnt_off0001360a.bin
3371a841d9e53c71ef2b714473b7f50125b2cc407c91617b9e4eefee0eff5557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 10560 bytes
font_02_sfnt_off00015a0b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0B 4324 bytes

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