Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02a15cb53befd5…

MALICIOUS

PDF

79.3 KB Created: 2021-03-17 14:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 290c068f21028d250f00261db3f65f68 SHA-1: a38a215889cccc269a0b9a73554df101df379fd3 SHA-256: cb02a15cb53befd5ba2cc18898c7df926e0936e1c36c9311b5bd6bab89592ccc
136 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating a remote support tool lure, suggesting the user is tricked into installing potentially unwanted or malicious software. The embedded URL points to a domain associated with malware distribution, likely serving as a download link for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://zajinet.ru/wix?keyword=splashtop+remote+desktop+apk
    • http://zumasuxujole.22web.org/acceleration_due_to_gravity_worksheet.pdf
    • https://cdn.sqhk.co/ruxuzobisu/fsx79NH/clock_countdown_timer_gif.pdf
    • http://sikirizev.22web.org/53659307806.pdf
    • https://cdn.sqhk.co/suxepemup/NlUhh8G/jivikavebebuzuvewupavelu.pdf
    • https://cdn.sqhk.co/segexiji/R8yhbgj/icloud_drive_keep_folder_download.pdf
    • http://puzigodemabotod.iblogger.org/wowipisupo.pdf
    • http://sukukotomi.22web.org/1985716507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_31d18272c5c14158b23e2dcab1343642.pdf?index=true
    • http://wotupeleson.epizy.com/58378390760.pdf
    • http://wufalejopasedor.epizy.com/ikea_buying_guide.pdf
    • http://ginarokexaf.epizy.com/jewozage.pdf
    • http://zezegakaj.rf.gd/74847237660.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_417df3b5c7ea456981c95d0da0572738.pdf?index=true
    • http://bividit.rf.gd/teacher_reflection_questions_and_answers.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_caf5cc848ee14121b868d43c6980591a.pdf?index=true
    • http://dazoxamawix.rf.gd/12712959343.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_edd7a8d411324f7884103abdc38e5e1e.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_1a2b33991a214f78a8ca6aa14b8e760f.pdf?index=true
    • http://lufadavebu.epizy.com/equations_variables_on_both_sides_worksheet.pdf
    • http://salegemivogo.epizy.com/cyberpunk_2020_books.pdf
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_0d570db6bd794f7d8f91805664baeb75.pdf?index=true
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b17ab50892fa46168bdaeb3b89a464b4.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_off0000f702.bin
8ddfdf42960c3679d3f222b95f16cd7346a0f68bc437c9dd7d402c7fea0839bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5364 bytes
font_01_sfnt_off00010912.bin
1e53ba2bcb504455f8963aa4042fc4c9824c9368f15f3711292be47e015284e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 11344 bytes

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