Malicious PDF — malware analysis report

Static analysis result for SHA-256 1625b8f10a8539d2…

MALICIOUS

PDF

70.0 KB Created: 2021-03-16 01:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b20bc0a52219182d496d8bda02c0414d SHA-1: 78691d77f9e61835536c82cf93fcf5c766093985 SHA-256: 1625b8f10a8539d207cad2bfb6fa8e171c13c283a941cffbaf2bffff597a21c2
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference a school bell schedule, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://seumenha.ru/wix?keyword=mickey+cox+elementary+bell+schedule
    • https://cdn.sqhk.co/keridola/2Rifchg/vulixezerufigawufaremit.pdf
    • https://cdn.sqhk.co/dufubimaru/4bQhgyU/5829599658.pdf
    • http://seomagnat1.online/fast_launcher_pro3q5l1.pdf
    • http://inostrana.com/amar_o_depender_audiolibrolpj79.pdf
    • http://yewes.space/63223321721n279i.pdf
    • https://cdn.sqhk.co/pulafefer/duG90rP/crayola_outline_markers_nz.pdf
    • http://shoes-storie.club/how_to_mix_rap_vocals_logic_pro_xxu8z3.pdf
    • http://mishabelle.ru/59627442005alskz.pdf
    • https://cdn.sqhk.co/godezixibufo/iajenAG/car_amortization_calculator_canada.pdf
    • https://cdn.sqhk.co/fokodusi/Dhdg1wo/18470206100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/476cabca-88be-4655-a57d-ffe69e3ce1a1/53783451189.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_a2d71e02816b434bbeb77d844e262930.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_d23432f125364405bad2dd968868d4da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e867bd75-562c-45e5-be0c-a94ed0238f96/japowotunarovomofuxuk.pdf
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_85c1cbd0e5fa4cf599e5e73bc43f58a3.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/loxon_primer_spec_sheet.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_476cc37d4db445f0bb5fb357a14619b3.pdf?index=true
    • https://s3.amazonaws.com/fonazuzixagizir/74713724909.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_6918f55703254ae3a0f76dca36aed54d.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_0347d3b91d534f0dab15715c979a1dec.pdf?index=true
    • https://s3.amazonaws.com/jigezilor/android_google_play_wifi_only.pdf
    • https://uploads.strikinglycdn.com/files/c10a9494-d25b-4c0c-a890-ffd846096c80/how_to_write_a_self_assessment_for_an_administrative_assistant.pdf
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_4bfb55a3c5f542c08e9b0f260f44a3b4.pdf?index=true
    • https://s3.amazonaws.com/jazuravazaguz/how_to_print_entire_dataframe_in_python.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_off0000d37b.bin
3ab2cd946dd594e9a41b29a9e780453e3aee993f580e5b84102abd390e0c0ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 5560 bytes
font_01_sfnt_off0000e645.bin
464206725fb14537ca7124d8073f55e64b73ce1323a8294bdaab6eef48386325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 10620 bytes

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