Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbb2df05b687e29…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 09:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151499432f08b09ecedf21332000750f SHA-1: bbdc7245adaea2d62bfb779c4400b264ffc3e663 SHA-256: 8dbb2df05b687e2962d45e719f128ce42a5f41071fd5e8ecd995b388e4a6f110
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/wix?keyword=brutal+black+dragon+guide
    • http://seweripuwas.mywebcommunity.org/algorithm_tutorial_bangla.pdf
    • https://cdn.sqhk.co/lukisebeka/SjabFfd/download_free_tv_app_for_android_phone.pdf
    • https://cdn.sqhk.co/rifojimuna/anz5Djc/download_bow_mania_mod_apk.pdf
    • https://cdn.sqhk.co/vekosozob/Aihnghz/street_basketball_freestyle_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/wazilisiko/auUhaej/old_school_games_for_ios.pdf
    • https://cdn.sqhk.co/wobuwaseja/8haPDgE/ladamebomorunuraz.pdf
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/juwizuf.pdf
    • https://cdn.sqhk.co/gokitoser/ESmgib0/pugagubinogugotuvorakux.pdf
    • https://cdn.sqhk.co/karadirimose/hgrjfcX/free_offline_vegas_slots_casinos_chicken_dinner.pdf
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/4192131.pdf
    • http://timinome.getenjoyment.net/bauchspeicheldrsenentzndung_ernhrung.pdf
    • http://julubavixukab.66ghz.com/87904460185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vumamuv.myartsonline.com/how_to_use_dyson_cordless_vacuum_attachments.pdf
    • http://sewoxoxitif.rf.gd/63486414849.pdf
    • https://uploads.strikinglycdn.com/files/94878cba-cd11-4f8b-8568-90b44bfe33bd/64982245639.pdf
    • https://uploads.strikinglycdn.com/files/19034ca1-0625-4d56-bede-ca1dbadfd532/zarifuvifemozaxewefusu.pdf
    • http://negikapivipen.epizy.com/god_ringtones_telugu_naa_songs.pdf
    • https://uploads.strikinglycdn.com/files/8460bc7e-aa3a-44d1-acde-5637b4d79bb3/4623858078.pdf
    • https://uploads.strikinglycdn.com/files/9f499c9b-d80e-411c-8cd0-0388f269ff4e/10612987192.pdf
    • http://depedoxuwe.rf.gd/jitofokozuvaponu.pdf
    • http://gejaran.epizy.com/crossword_quiz_answers_brands_level_1.pdf
    • https://uploads.strikinglycdn.com/files/516897b6-d8a2-49b1-9eb3-df83eccbf76c/97715332447.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_off0000fdf6.bin
56a60f844ed383fd52c515bd2cf03d3182c5aecf8c7c6974b508ced7e92a82ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 5064 bytes
font_01_sfnt_off00010f38.bin
ebb52c1111b3491ad68b15468023998b1a5f42f1b93802e58878f6e79bc1421f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10916 bytes
font_02_sfnt_off0001348e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 4324 bytes

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