Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda422c60fbf0495…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 04:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9ee0fa3d74f2eaf9758d741b0c0550d4 SHA-1: 9cff556260561aaad9e8e0b6d350d10a424ccd9f SHA-256: cda422c60fbf0495eaf49dfec519392827918d544373d02d96d34f8b534cda46
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=foundation+book+for+civil+engineering+pdf PDF link annotation
    • http://xilenemivagola.mywebcommunity.org/ielts_reading_answer_sheet.pdfIn PDF document text
    • http://lexisunat.iblogger.org/free_sweetheart_bodice_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/gtYieWp/83979527848.pdfIn PDF document text
    • http://craftsmansmetics.com/96364701273m026o.pdfIn PDF document text
    • http://sunshop.pro/sony_mex-n5000bt_apphykrc.pdfIn PDF document text
    • http://dizevenituwokuz.22web.org/algorithme_exercices_corrigs.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/nsw_public_sector_capability_framework.pdfIn PDF document text
    • http://namedaun.fun/mozezaniduxa2h1j.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/hjhqhd2/25290655435.pdfIn PDF document text
    • http://resufomuvojos.22web.org/vizezu.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/cgcM5NW/fifawawilubawinawasolufi.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/apache_web_server_tutorial.pdfIn PDF document text
    • http://vizit.store/is_mechanical_engineering_a_professional_degreet25nn.pdfIn PDF document text
    • http://on-arenas.com/pefagijoxmbw0f.pdfIn PDF document text
    • http://moresukko.ru/kekejatedimowedoki4426r.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/computer_application_in_business_bba.pdfIn PDF document text
    • http://lakcherie.ru/star_wars_bookmarks_craftv7bq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lujonas.rf.gd/adjective_and_adverb_worksheets_for_5th_grade.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/84021210837.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_112972ef74f74aa0bec16687a01eabe5.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_a0f9737b8f7c49018af13a0cde04e053.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_2c264a132e434881941a65c188196a5f.pdf?index=trueIn 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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5364 bytes
SHA-256: 63cdf2372e5762f8f4b56238b923afdce98a640c49ff1b91bc21a97edd987493
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 9912 bytes
SHA-256: dc47844bd8214cd4d0cf4c7047db3216b6e684f0ba39dab67c5ad56e743aff2c

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