Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb55d3a035a773…

MALICIOUS

PDF

70.6 KB Created: 2021-03-02 10:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e98eabd8e29b876a3e3602216c43b0b SHA-1: 03471cdb3d889d2c8e14e4b6a4c725e2ca205c0a SHA-256: 57fb55d3a035a7730d591dfb765737fc90c5e184d0222b20967ecf9643f72364
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites for further exploitation or credential harvesting.

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 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.
  • 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://midufefew.ru/wix?keyword=edesign+curriculum+lesson+4+answers PDF link annotation
    • https://cdn.sqhk.co/pemenixa/hDTjioC/wisanafaromorufika.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/1684917.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/vjgZjie/11710831320.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/4178840.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/fxZijhi/student_beans_asos.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/phjcgjG/mlb_finals_bracket_2020.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/sepulixuzatigitexar.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/aEijid3/3d_racing_games_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/idtvgiF/xuvuzakow.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/djeoNrD/99381450420.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/penevixet-memumewesak-virodiwasamiva-gizolajopabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5ff4ee2c67b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fe7d1e1f1632.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/thfjjQW/watch_tv_channels_live_free_android_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff90a52b8f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_60273036af639.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/egigjSm/maxpreps_high_school_football_ohio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 5396 bytes
SHA-256: c7aed83f1d500686794ebebe91422b07ac80f71d6d6e7a6e5b30d7e428d5fab9
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 9752 bytes
SHA-256: 7dd5ae71816a7af962c0cca53b6273fb2b51edc4d13e0875a1d853eef06a036d

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