Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed09a2df4ab712a0…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 21:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 07726dae3abbd2361013435de64ee010 SHA-1: f92431d8da6d8ae287bb29efb2c61952b8ee2bad SHA-256: ed09a2df4ab712a09c82547d19605c2693402732db3278117b72c058477452df
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI, and the ML classifier flagged it as malicious. The document body, though partially corrupted, suggests a lure related to 'bstc answer key pdf download'. The primary IOC is the external URL found in the heuristics and document body, which likely serves as the malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=bstc+answer+key+pdf+download PDF link annotation
    • http://idealslim-ordina.site/kigamesivysr5c.pdfIn PDF document text
    • http://znakomstva69.space/66735064915oj6s3.pdfIn PDF document text
    • http://usacarins.com/que_la_fotografia_aereaaujzg.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/bizeja.pdfIn PDF document text
    • http://fomilexavekol.22web.org/jazumuzujagudezeguzogeke.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/nationalism_in_europe_class_10_notes_meritnation.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/bone_marrow_smear_preparation.pdfIn PDF document text
    • http://banquepopulaire-fr.org/free_avast_antivirus_1_year_validitydb445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/45414656309.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/homebase_cotton_dust_sheets.pdfIn PDF document text
    • http://fakipewoze.rf.gd/luvaxowojevunapozabumur.pdfIn PDF document text
    • http://donakabaxes.epizy.com/fernando_pessoa_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/escape_room_game_level_174_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/newisewokipudibogozifazi.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/behringer_x2222_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/pps_label_template_14_per_page.pdfIn PDF document text
    • http://gitavini.epizy.com/transformation_index_bti_2018.pdfIn PDF document text
    • http://goxabobuti.rf.gd/effects_of_deforestation_in_southern_africa.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/bizezipufiwonamitin.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/math_exercises_for_kg_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/the_wolf_among_us_adreno_full_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/vidmate_video_er_apk_app.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5456 bytes
SHA-256: 287bff337cad4436e33a6d1b2e7d9e92a4c739d5b04a3f292d5cd3f3feca3d4a
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10860 bytes
SHA-256: 5cbe7a771da28847001e30dc50fab9cde971422e5935eaebee1d2e522eaf22b7

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