Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ee799aee91af24…

MALICIOUS

PDF

71.2 KB Created: 2021-03-02 07:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8b9b50eaec9c039e150922bb7713b43 SHA-1: ed19bb125632fe3ad8349265d1f54cd2682ece5b SHA-256: c2ee799aee91af24f8827cb8b7b9d8d922200ad4f5349ee2aa4adf3d68831579
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wix?keyword=hardest+game+ever+unblocked+66 PDF link annotation
    • https://cdn.sqhk.co/lajakukilo/hdWVyjh/87674298381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_603b19d013652.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/zjbhck1/dipasukolisaj.pdfIn PDF document text
    • http://mon-cmb.best/rodojapohfq6j.pdfIn PDF document text
    • http://mydenverneighborhoods.com/banaxifevoroposa46knp.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/barclays_help_to_buy_isa_application_form.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/georgia_on_my_mind_sheet_music_trumpet.pdfIn PDF document text
    • http://phulop.store/xavupomubqgp3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fe2e4bf5ed50.pdfIn PDF document text
    • https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/7229958.pdfIn PDF document text
    • http://studytogether.fun/strikemaster_ii_pro_french_door_kitqmvhv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ff7cc7ebc2bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/microsoft_project_professional_2016_64_bit_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/samsung_j400f_flash_file.pdfIn PDF document text
    • http://luselobek.epizy.com/exercises_on_past_tenses_with_answers.pdfIn PDF document text
    • http://gavuzolu.epizy.com/ultimate_boot_cd_windows_7_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/suzubitovukopobumazux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 5640 bytes
SHA-256: 97928f0e37f1074231bc878c44377e70653f864570ec3c8fd81eea83fc896f8f
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10208 bytes
SHA-256: a24f08850f75a04553199fcf743a9749886deb6212c3e994009a02873633c337

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