Malicious PDF — malware analysis report

Static analysis result for SHA-256 756cc452604594ac…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 20:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aee258c825b037d2e82899fd70cfff96 SHA-1: 8034c68572f929ec19cab642dc29a1e699736472 SHA-256: 756cc452604594acc16dd3a1e4c654f7284b992f44617b2363b9f64a42ae88bf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF that uses a social engineering lure, instructing the user to install a browser extension or update to view content. It contains an embedded URL pointing to a suspicious domain, and ClamAV detection confirms it as a phishing trojan. While no scripts were directly extracted, the nature of the lure and the embedded URL suggest it's designed to lead to further compromise, likely through a malicious payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/award?keyword=ndt+level+3+study+material+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492586/normal_6033606564747.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/ieKcb0r/cambridge_history_of_southeast_asia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374986/normal_60095a23d86d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/BgWyghs/sims_4_magic_mods_without_expansion_packs.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/hf1JjhQ/hawthorn_bank_routing_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/pdgfNgj/bubble_boy_gift.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jigeviX/crowders_mountain_state_park_fishing.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/gUgdhfN/football_field_kick_cheats_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/iihegfQ/jopumenurebimunej.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/EMMjhij/17939802829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5fc777d7e5976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6045e8f3dd79e.pdfIn PDF document text
    • https://cdn.sqhk.co/sotogademo/cjc4JdF/cordiality_in_a_sentence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_601fae92cc5be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6015294ca9233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb5a901-f3e8-4b12-940b-d8cd82445dc8/tederosuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5b5505-da40-491f-b4ff-4d5691d3686f/fadub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda18fd0-d71d-4d5d-a935-9c02459815d7/xupikigosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fb6603-bde3-4636-ae73-f13b85291a0e/tipazuwitemabuxelawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e75cb00-7f71-42d6-847c-641e8e2c6a7f/better_way_to_say_weather_the_storm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822759dc-031c-4ad8-a43e-64396f8887d8/lumurisevixufaxutuzamekug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6596151e-7d0f-4109-8865-0672f0f6d450/descriptive_essay_on_my_favourite_food_biryani.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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5480 bytes
SHA-256: 55dc6e055184b3c7a89cb435205496a87070df657d6b9472d1867b07f18a1a1f
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11056 bytes
SHA-256: afaa5c3305640ac4dce3e225c2b77e481f9c6b138a0a1644dbd7510d33d7e714

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