Malicious PDF — malware analysis report

Static analysis result for SHA-256 f220a5862761bd2d…

MALICIOUS

PDF

79.1 KB Created: 2021-05-20 06:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ac7da37d81814721062b2f8effa4fb1 SHA-1: 6d99addcf2a3b695a713c3bad9cdabc321092caf SHA-256: f220a5862761bd2d956a01587c9d7af4e4ac47cfc079230e5ec774ea11a6628e
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious URL, 'https://seumenha.ru/strik?utm_term=idle+slice+and+dice+hacked+apk', which is likely the download source for a secondary payload. The presence of a visual download button heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=idle+slice+and+dice+hacked+apk
    • https://cdn-cms.f-static.net/uploads/4484355/normal_604ed8c618bce.pdf
    • https://static.s123-cdn-static.com/uploads/4377936/normal_6006ab2c4d71b.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_601f544969d9c.pdf
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb6c75f28ee.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_605f3c232c888.pdf
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fda7f0a29746.pdf
    • https://cdn-cms.f-static.net/uploads/4401973/normal_606401464c52a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kokesatodixon/7391365469.pdf
    • https://s3.amazonaws.com/ganubifirigevi/sql_server_2008_standard_edition.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/samawebivefipepibuzaxij.pdf
    • https://s3.amazonaws.com/sisaxu/realtek_audio_drivers_windows_10_64_bit_lenovo.pdf
    • https://s3.amazonaws.com/baxunaf/import_excel_sheet_data_into_matlab.pdf
    • https://uploads.strikinglycdn.com/files/7ffcb05c-f864-49ee-baae-e7cd6fb906e6/61350088570.pdf
    • https://s3.amazonaws.com/befafuni/bitlocker_drive_encryption_deployment_guide_technet.pdf
    • https://uploads.strikinglycdn.com/files/815e51a8-b75e-41b2-b37d-4cbcac0e7715/28878268651.pdf
    • https://s3.amazonaws.com/dinigugaxej/goal_setting_template.pdf
    • https://uploads.strikinglycdn.com/files/7f54cb6c-8853-4111-afe7-e7bbbad63a41/masterbuilt_electric_smoker_recipes_whole_chicken.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_off0000e4bc.bin
112457957d02086c9f0e443d9342bfd5096a86a91442b7b336f1a819db7fda53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5068 bytes
font_01_sfnt_off0000f5ef.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 1800 bytes
font_02_sfnt_off0000fe7d.bin
25e06d55dbfa5674a5e0423d51b26b3ebbc1206959a7272c38f6670542802991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 15472 bytes

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