Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dedf2870252cde…

MALICIOUS

PDF

81.9 KB Created: 2021-05-19 14:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29faf0f76feb17ef7728966b5b66008f SHA-1: a7ce9baf9ac9bf2885e5af7579f5dd04ec655335 SHA-256: 81dedf2870252cdea8ea7b14a008e3ae021043e946bf60df12e1332beada37ab
96 Risk Score

Malware Insights

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

The PDF file contains a URL that mimics a search result for educational content, likely as a lure. ClamAV and ML classifiers indicate malicious intent, specifically phishing and trojan activity. While no scripts were directly extracted, the PDF structure and embedded URI suggest a phishing attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://nipisod.ru/strik?utm_term=imagenes+de+maquetas+de+la+celula+eucariota+y+procariota
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fe19c1773156.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_600f18e4d250e.pdf
    • https://static.s123-cdn-static.com/uploads/4375077/normal_5fde7d84bedf4.pdf
    • https://cdn-cms.f-static.net/uploads/4481834/normal_60258d9e74b28.pdf
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fe0a8fe432f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fujadabez/fractions_to_percents_worksheet.pdf
    • https://s3.amazonaws.com/gezetega/definicion_corta_de_languidecer.pdf
    • https://s3.amazonaws.com/pekatikisuruki/types_and_order_of_rock_strata.pdf
    • https://s3.amazonaws.com/kokesatodixon/31852162446.pdf
    • https://s3.amazonaws.com/mozedijiz/73327191693.pdf
    • https://s3.amazonaws.com/gujutavevive/nokulorol.pdf
    • https://s3.amazonaws.com/wujanozo/nist_blockchain_technology_overview.pdf
    • https://uploads.strikinglycdn.com/files/fb9acda2-daa5-496e-ad1b-81ed18a238aa/vulugikuseserosum.pdf
    • https://s3.amazonaws.com/sajatofubote/android_studio_3._0_change_package_name.pdf
    • https://s3.amazonaws.com/fewunadupop/vivofit_jr_2_waterproof.pdf
    • https://uploads.strikinglycdn.com/files/871639e8-7465-485a-84ec-cc19084333e3/what_does_it_mean_when_your_smoke_alarm_is_flashing_red.pdf
    • https://uploads.strikinglycdn.com/files/c4d26743-23f1-4bf8-b587-ac8b4811ae68/30358764781.pdf
    • https://s3.amazonaws.com/timeziso/iso_9001_version_2015_en_francais.pdf
    • https://s3.amazonaws.com/mubemutolewe/xojaduvevobadizodazo.pdf
    • https://s3.amazonaws.com/kegovev/12608463752.pdf
    • https://uploads.strikinglycdn.com/files/e4c85128-d901-4025-ab28-ad31c427a4fe/zojirushi_bbcc-x20_replacement_parts.pdf
    • https://s3.amazonaws.com/xonaxevetaf/android_studio_comment_shortcut_key.pdf
    • https://s3.amazonaws.com/zowejunef/nikepimubalixononilu.pdf
    • https://s3.amazonaws.com/semuxemakaw/94859966727.pdf
    • https://s3.amazonaws.com/rexogeguxosix/arcane_quest_legends_game.pdf
    • https://s3.amazonaws.com/lomiwexuva/las_grutas_de_cacahuamilpa_informacion.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin
e23c5c7b156c58d0ca6d643d847d7d16f689bf9fc47f414feb060f912e5eef5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5440 bytes
font_01_sfnt_off0000ed1c.bin
6011e69b46dd3606a193cdaeeb051d32c0f68e550d28626f47ad94ca509fa06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 11684 bytes
font_02_sfnt_off000113a0.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 16164 bytes
font_03_sfnt_off0001289c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 4324 bytes

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