Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9f6d1d1b7e8719…

MALICIOUS

PDF

73.5 KB Created: 2021-03-21 20:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a1a6be07f72117300efab80f5ce459 SHA-1: 4f1e464618a65eb119df6b0aa1eab083436a9b51 SHA-256: ab9f6d1d1b7e8719eb5ef9845a09884adc9ca55be725a669a8b367d8f14010aa
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that, when visited, likely leads to a phishing or malware download site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'monohybrid cross practice worksheet answers' and the authoring application, suggesting a lure to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=monohybrid+cross+practice+worksheet+answers
    • http://xefopuro.mypressonline.com/25403869763.pdf
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/dufomonubi.pdf
    • http://tipofeliluget.medianewsonline.com/international_marketing_manager_salary_in_malaysia.pdf
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/7647786.pdf
    • http://xosuvirakogaf.iblogger.org/english_guide_for_class_6.pdf
    • http://xunetokawetik.sportsontheweb.net/catalogo_viemar_2020.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/9636053.pdf
    • http://lajodibibodi.getenjoyment.net/past_simple_and_past_progressive_exercises_with_answers.pdf
    • http://jakesubinosol.scienceontheweb.net/medical_spanish_book.pdf
    • http://mupulopi.22web.org/ethical_hacking_books_in_urdu.pdf
    • http://vurujupafowutox.mypressonline.com/how_to_blog_beginners_guide.pdf
    • http://lozejebivo.scienceontheweb.net/whats_the_best_scope_for_a_marlin_model_60.pdf
    • http://pawarelubasiwu.iblogger.org/mugodiwizibunajaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ea6f59ef-f995-4c6e-97eb-02ea7f1a540d/banewusinivu.pdf
    • http://dimebuturerab.epizy.com/bikowapabanes.pdf
    • https://uploads.strikinglycdn.com/files/2932f4ff-0ec1-455e-a56e-389333d39617/how_to_clean_wahl_peanut_clippers.pdf
    • http://pekomuvave.myartsonline.com/23209692579.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_8172bd1836414b268086b2cc45b91265.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6234e834-56a9-4d30-bf1e-19d6eea035bb/53593111552.pdf
    • https://uploads.strikinglycdn.com/files/dda6798f-3b29-4819-90e8-2ae209d5519a/taco_bell_shredded_chicken_quesarito_nutrition.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_0d0fd96bc44d49cea9850c4e0ce46967.pdf?index=true
    • http://vewawisu.onlinewebshop.net/83974854976.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_c202a5a971cb4be5bd97f6496d2bb8e4.pdf?index=true
    • http://josekopiguvalup.epizy.com/sundance_spa_sentry_850_parts_diagram.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50c.bin
b51c34a7588b9bf30741380154262fcdd48c1e56312b75cb98a9a59ca5dab550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 5532 bytes
font_01_sfnt_off0000f7f1.bin
392113df2d5f20b85b44e3c7d35a714ec1d27c34975fba0f8244002a9faae0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 9404 bytes

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