Malicious PDF — malware analysis report

Static analysis result for SHA-256 439bae83f4cfc97f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 13:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d9aa86bdb195bfa22bf95694cb734c0 SHA-1: ea22a797fa97ea574a00cc83eddc3756c54353df SHA-256: 439bae83f4cfc97f0c203dcd5806382d0708ee78a60e55ccd9ac83beb44b35c5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the creation of a link farm with numerous external PDF links, suggesting a phishing or malware distribution scheme. The primary URL, https://mezovuduw.ru/wix?keyword=thomas+dale+high, is likely the entry point for this campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=thomas+dale+high
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601643230bb30.pdf
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/4281234.pdf
    • https://cdn.sqhk.co/kamavedes/jcuagji/72932288843.pdf
    • https://cdn.sqhk.co/wudarivat/v4FjjRb/westworld_game_android.pdf
    • https://cdn.sqhk.co/molivovuki/Khchfhg/creative_curriculum_mighty_minutes_objectives.pdf
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/5250456.pdf
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/b9e2d37db14.pdf
    • https://static.s123-cdn-static.com/uploads/4368235/normal_6003b14ec463d.pdf
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/malusokafef_mugajamajitapos_mavokafora_lalevoga.pdf
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/4067eaef4.pdf
    • https://static.s123-cdn-static.com/uploads/4409814/normal_6006719343b04.pdf
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fdc22510a892.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/mafumutalutol.pdf
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fc8d499521fd.pdf
    • https://cdn.sqhk.co/livujiguf/wjghjMZ/84792101227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a677ac90-b59a-40fd-81fc-40abc20c70ae/zumeseniragetevutox.pdf
    • https://uploads.strikinglycdn.com/files/b02ffc8b-b8a9-4d2b-83f6-36c93db644b9/59344349808.pdf
    • https://uploads.strikinglycdn.com/files/383670a0-7799-489e-82f1-4dcf99bd7431/flight_simulator_2020_xbox_one_vs_pc.pdf
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_fcae2f9581244bdab91994d45c5b7dab.pdf?index=true
    • https://21e22d26-41c4-45db-adc1-f279a95720e3.filesusr.com/ugd/9b7d8a_b4bbb36babfb4b08911146cd12135ce5.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_44455f4e7b394f20a3e71a967a495362.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_e567bed4aebf4406bc4f1b4342896f03.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_cfe5654a387045d2bda0d629c1336c86.pdf?index=true
    • 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_off0000f46d.bin
bd6c046f657f13c925198e0ce9aa225d09f0fe0fd71cac0fd3686973ca7e2fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5092 bytes
font_01_sfnt_off00010592.bin
30ee1185ded9b70d00fc30f4d05dc0011bbba77954af595c8d19a7bea0c79af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 11316 bytes

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