Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b519540e57996a…

MALICIOUS

PDF

72.1 KB Created: 2021-04-04 18:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96bbbe37c99276af528c27d55799db7e SHA-1: 7e6d8b9830f21f2cb21cb95ce292c0551206161d SHA-256: f7b519540e57996add0573a62e33087f9e0aaad30f0ca881fbd4abd1947e909f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, potentially to distribute malware or phishing content. While no scripts were explicitly extracted, the presence of numerous external URIs points towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=livro+arquitetura+bioclim%25C3%25A1tica+pdf
    • http://digitalmedialit.com/warcom_genesis_mod6e2qr.pdf
    • https://nulomofog.weebly.com/uploads/1/3/4/3/134331556/fanepixexusebesedid.pdf
    • http://mmmuuuue.space/street_fighter_4_apk_all_charactersx8247.pdf
    • http://subonus.ru/29464671236nehc9.pdf
    • http://ulekschool.online/zalilurafazuvufurebenovjm.pdf
    • https://cdn.sqhk.co/jufebarur/g8jj3id/joxelavod.pdf
    • http://alteramaks.world/a_friendly_introduction_to_number_theoryshlhu.pdf
    • http://datingsexchat.site/sapexipidjoww.pdf
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/793808ff6ace335.pdf
    • https://cdn.sqhk.co/xawobovuji/e0ievij/beautiful_dreamer_lyrics_beatles.pdf
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/midofodaziw.pdf
    • https://cdn.sqhk.co/bibikodazit/ewig8ja/sazapanevetedolakebivofit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_72ca9a936c0f412b81f69baad5f929ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35cec295-0e46-4611-aec2-0de30160ade3/femunififaxipakire.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_695610284b7847b6b246ea8609568f7b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2495987-f1cf-49de-b8c5-c59e0f11b473/can_alkaline_diet_help_acid_reflux.pdf
    • https://uploads.strikinglycdn.com/files/fd0b4bac-98f8-490f-9fe7-884db903a593/kitamepojedumamuxaboban.pdf
    • https://uploads.strikinglycdn.com/files/423188f4-d446-4e9a-9ba8-e43ae80a203b/honda_express_sr_parts.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_e908bae63a9b4cf9b87ed3e9ce700669.pdf?index=true
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_2fddc837ccde4f91a27450ee2a40601b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6827ac43-f653-4c5c-b88b-ffd0769c06a6/concepto_de_interes_simple_y_compuesto_en_matematica_financiera.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_8b2e2b3700674410ad1dcc564c92e3fc.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_off0000d721.bin
640876b7db703013dab29cc5946b009dcf8673769992efb01ea801abcec08780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 5624 bytes
font_01_sfnt_off0000e9a7.bin
689ee5f3eeef5e5edf9cb29b9efafe2c4c735dfbc95d0d6c0495117e71b88672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 12848 bytes

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