Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c7055db00d927…

MALICIOUS

PDF

85.4 KB Created: 2021-03-20 03:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 715817a5fa2de5a1d90d082d19df378d SHA-1: c98fb3d7c0a8b13b92965729517859f4d30ac89f SHA-256: 5f8c7055db00d92761d12feadb4f61739f9319e9c10a5e27df7bb2102849e5bf
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=prevention+of+coronary+heart+disease+pdf PDF link annotation
    • http://vowufijetapiko.sportsontheweb.net/algo_trading_basics.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/auscultation_of_heart_sounds.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/80049191148.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/23616574921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fdb6c11e1045.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/echhHtt/nintendo_switch_lite_colors_pink.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/jfjhIuF/speed_night_3_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_6037c8b428ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fe98e2c667dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6045dc184c2f1.pdfIn PDF document text
    • https://cdn.sqhk.co/lazaxosu/IhhNjaP/14382221009.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/PggjfWA/tapsonic_top_best_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/dPfST26/principles_of_management_for_bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_603208133c5bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/d631e34f-e390-458c-b990-6797804bba9e/wanabunakefofumikiw.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/sqlite_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df87112-5001-4250-b0f5-4583718a717d/watch_fiddler_on_the_roof_full_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6721cf66-b20d-4904-aa02-4b67cb618da7/amelia_bedelia_by_peggy_parish.pdfIn PDF document text
    • http://fexinitakemalu.epizy.com/kibomudixukanifenenuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3452baa1-0e03-435b-8f95-25aa1e4027ff/gipezozumimopeki.pdfIn PDF document text
    • http://josunida.epizy.com/bulatujiwo.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/53587576185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5628a816-9a1b-472c-930b-065331cfbab5/myers_briggs_infj_meaning.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/calentador_solar_casero_con_botellas_de_plastico.pdfIn PDF document text
    • http://nagasawovebuba.epizy.com/como_agua_para_chocolate_libro_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5327439b-1bb2-430b-b585-7c2172c52056/what_are_some_themes_of_a_story.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 5376 bytes
SHA-256: caaf7c3c75c65b42f2a0634ce6aff7ed2e18da34ce43d8647150ca323270a923
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 11024 bytes
SHA-256: 4c95e505b7a0aafd82076c80086c54ab6c04cce7b4d01f14cf3a2c35558ee8ad