Malicious PDF — malware analysis report

Static analysis result for SHA-256 997c393ef42d20cc…

MALICIOUS

PDF

68.0 KB Created: 2021-04-06 14:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d85d9cace9f8cf8f8e04165312b985 SHA-1: 673601939d719aa2ccb533480fbcec6758696aa6 SHA-256: 997c393ef42d20ccc780b03e9605a4e8881905425d9f29e545941ab7c50e6f05
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is malicious, specifically flagged as phishing and a trojan by ClamAV. The document body, though heavily obfuscated, suggests a 'quiz answers' lure. The primary malicious URL identified is https://jacksth.ru/wix?keyword=blood+basics+quiz+part+a+answers, which is likely used to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=blood+basics+quiz+part+a+answers
    • https://cdn.sqhk.co/gepelarawazu/iiju0nt/project_cerberus_1._3.pdf
    • https://cdn.sqhk.co/kufiremikaf/yyjijew/destiny_crota_s_end_raid_guide.pdf
    • http://vvinorama.website/sqlite_manager_for_mac_os_xp8qe6.pdf
    • https://cdn.sqhk.co/rasetiwulipu/gchb2gi/11891174501.pdf
    • http://chuvashovfamily.ru/sajur48q2p.pdf
    • https://cdn.sqhk.co/tufuboloruj/uE2gjgd/golf_clash_golden_shot_cursed_swamp_hard.pdf
    • http://uaportal.site/kozinoradou8dev.pdf
    • https://cdn.sqhk.co/tuxarulenogu/jcjav6c/beach_buggy_blitz_game_for_pc_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0834e046-b7f9-4cb3-8774-3e5108a88fd1/13523684483.pdf
    • https://uploads.strikinglycdn.com/files/bc556e03-85ef-4d6b-bc2a-2714425afe9b/tivitibipusolasugalu.pdf
    • https://uploads.strikinglycdn.com/files/136ada54-3792-4e87-9bbc-d56a2d191f0d/wotujizaxek.pdf
    • https://s3.amazonaws.com/dabatisew/49042213078.pdf
    • https://uploads.strikinglycdn.com/files/baf7ea4a-986e-4097-a2d7-f6b3495fd141/delta_22-540_blade_gauge.pdf
    • http://veruzixiki.rf.gd/google_camera_android_version_6.pdf
    • https://uploads.strikinglycdn.com/files/a02bf2bc-5777-4aa1-82d2-182e09501ab5/90715997279.pdf
    • https://s3.amazonaws.com/nakevoja/79323358446.pdf
    • https://s3.amazonaws.com/tugumeb/78669723216.pdf
    • https://uploads.strikinglycdn.com/files/23c09c37-8b9b-4d0c-83b2-f31b3eb51c21/97175820650.pdf
    • http://foxivinavil.rf.gd/alexandra_gheorghe_amantele_trecutului.pdf
    • https://s3.amazonaws.com/wewuxuviwar/features_of_spreadsheet_application_software.pdf
    • https://uploads.strikinglycdn.com/files/1ee4b2ca-94f5-4f60-9072-1ae95ae3660d/91370024726.pdf
    • http://lebelolejesupo.rf.gd/online_banking_management_system.pdf
    • https://uploads.strikinglycdn.com/files/868d0fe4-a2d3-44b9-9be8-860bd40ecee2/basijelozelimafizenipizi.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_off0000cd1e.bin
b966c7fe1a59500fd3ddeb63c18c0e0f13f14774cfb6a679cc4a3e6fb2bfac4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 5524 bytes
font_01_sfnt_off0000e013.bin
f28a257f9acc770044d0b7db43da9ecdf89dd32bbe3546eb47b6893c108c7f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 10132 bytes

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