Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40f469288015f3…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 19:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ad3f4cd9883c8bef21c51408a6a952 SHA-1: df2bd383249e50a54c0a4c01be852bfb4b650519 SHA-256: 5c40f469288015f30b311b9bd5830e40280a53c889cecb2b5bbd205893d2646d
96 Risk Score

Malware Insights

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

The file is a PDF containing an external URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes the suspicious URL, indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the overall detection suggest it's a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=eternal+footman+meaning
    • http://zumbayuliya.online/37807646896z2h9v.pdf
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5ffd576ae554e.pdf
    • http://musofiron.ru/90747023617r4a6c.pdf
    • http://kigurumi.org/how_to_use_farberware_5_cup_coffee_maker14eqx.pdf
    • http://dresdenpharma.ru/download_game_kamen_rider_climax_fighters_pc4kp21.pdf
    • http://raruvutemogogog.iblogger.org/pumixitobo.pdf
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5fcfe4772acbd.pdf
    • http://my-favshopc.online/dead_space_3_android9l5rx.pdf
    • https://cdn-cms.f-static.net/uploads/4422884/normal_602c553ce5f6e.pdf
    • http://fozogadixanemo.iblogger.org/better_business_bureau_irvine_california_phone_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/93d16bd0-3aa5-4425-b94c-768786218764/kuvijaluguvezulugez.pdf
    • https://s3.amazonaws.com/bokofapig/6684570171.pdf
    • https://s3.amazonaws.com/tixeligufokup/95835771725.pdf
    • http://tefinavi.epizy.com/guess_who_is_under_the_sheet.pdf
    • http://bomajada.epizy.com/why_isnt_planet_fitness_24_7.pdf
    • https://s3.amazonaws.com/fajeloninesitel/yearly_calendar_template_excel_2020.pdf
    • https://uploads.strikinglycdn.com/files/5016ec18-9fde-418c-bf38-49598539ab33/how_to_start_a_reflective_essay_introduction_examples.pdf
    • https://s3.amazonaws.com/wizedumi/mubimugex.pdf
    • https://s3.amazonaws.com/wibadinavosunom/takoridizim.pdf
    • https://s3.amazonaws.com/gofilafixu/48225269307.pdf
    • https://uploads.strikinglycdn.com/files/a411dbab-e34b-4e1e-91a5-26af33cd7a15/skim_milk_on_21_day_fix.pdf
    • https://uploads.strikinglycdn.com/files/da580bef-c0fc-492f-884c-91a93ef1868f/dimalazinezisoxunij.pdf
    • https://s3.amazonaws.com/wovugi/first_written_warning_letter_template_australia.pdf
    • http://gesulomesazisaj.epizy.com/field_hockey_glove_size_guide.pdf
    • https://uploads.strikinglycdn.com/files/094629fe-3480-406d-8d08-e19b24a7187e/tutorialspoint_asp.net_interview_questions.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_off0000ee84.bin
191d0d6dbfea354f1a72a78c0d37fde88e61ce41b2cd9bb273e36475cb41a66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 4868 bytes
font_01_sfnt_off0000fefd.bin
455735fac970b462dec85b4cd998fa40b8f1e59ab0fd41a364077ecc547582ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10856 bytes

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