Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbd37acece177ea…

MALICIOUS

PDF

83.5 KB Created: 2021-03-18 15:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4945220249b6038df25455c9375616db SHA-1: 18478eb9c3bd7f72172c62e11182e650f3f1933d SHA-256: 9cbd37acece177ea7019f6eca3f36824b0c385d5852de76e9e1c0559792c6e58
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of many external links suggests the PDF is designed to redirect users to malicious sites, potentially for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=beethoven+moonlight+sonata+3rd+movement+sheet+music+pdf
    • http://zebrait.fun/75333229745ul9ku.pdf
    • https://static.s123-cdn-static.com/uploads/4411683/normal_5ffe973002af9.pdf
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fde3fa2271d5.pdf
    • http://hookup755.fun/a_court_of_mist_and_furylva17.pdf
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fde5936dab58.pdf
    • https://static.s123-cdn-static.com/uploads/4378161/normal_5fe5808cb9ab8.pdf
    • http://aduo5.online/dake_annotated_reference_bible_large_printzikg4.pdf
    • https://cdn-cms.f-static.net/uploads/4474997/normal_6011e11760cfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kevava/sukidogemoxarolupotumut.pdf
    • https://s3.amazonaws.com/vuxalirudidel/delagukakugesokipidup.pdf
    • https://s3.amazonaws.com/zerepuzuze/the_crown_season_3_episode_7_fact_check.pdf
    • https://uploads.strikinglycdn.com/files/c532500f-adf3-4a80-8242-bfa06c805af9/celestron_inspire_70az_telescope_review.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_cf100fc4f8264a29ab770b0d7f08b5ec.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/what_was_canada_before_1867.pdf
    • https://uploads.strikinglycdn.com/files/d340fa1f-afd9-4e7d-9618-64b2fca032a7/usmc_uniform_inspection_form.pdf
    • https://s3.amazonaws.com/retisovojor/bajirao_mastani_full_movie_1080p_worldfree4u.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_cf0359dff37a4f0db21e466ea48985f8.pdf?index=true
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_5c536bdc051d4e30a4683ffcfa9618cf.pdf?index=true
    • https://s3.amazonaws.com/sosupejuxofedo/bedtime_stories_for_babies_free.pdf
    • https://s3.amazonaws.com/takateg/visamaselexodunapurobit.pdf
    • https://uploads.strikinglycdn.com/files/2da807a9-6c01-4bc1-b1ac-efbe270875e4/nedopibodifitosegagidi.pdf
    • https://uploads.strikinglycdn.com/files/a8aaa372-9c6f-4e7d-91e6-a54e5e3e24bb/how_to_change_time_on_g_shock_5081.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_fbd0c12279e846e9a97fd873aa49b82d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/63188782-7223-479b-b1d7-0b06c8db2e2e/how_do_you_open_a_locked_oven_door.pdf
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_a5fa9e48f18042dbb22e13515104f58e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7f.bin
ea1a06d804215d1e22bbd255ac615e1389310a64ed6cf6d4c5ea8cf6f0856386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5840 bytes
font_01_sfnt_off00010141.bin
30eddea34aaf1702352ec47f2150f174d120f8f2e3130b38d40f82811cb87eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 12452 bytes
font_02_sfnt_off00012ad8.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 16096 bytes

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