Malicious PDF — malware analysis report

Static analysis result for SHA-256 acac9d49bf796630…

MALICIOUS

PDF

67.0 KB Created: 2021-02-25 13:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f622fb5285dc4ca8687c088f3db6821 SHA-1: 74fb12be8ef59a4d41fb8ef874e4b2f8d59495ef SHA-256: acac9d49bf79663035051a9f9468fd44038f4daf8e897e84e677a2e565c63ef5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=thomas%20calculus%20instructor PDF link annotation
    • http://zikewexer.scienceontheweb.net/what_is_the_difference_between_vivofit_jr_and_vivofit_jr_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/dhiibgh/saviry_deals_freebies_salesforce.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/Kgf22eb/anger_of_stick_4_mod_apk_android_1.pdfIn PDF document text
    • http://delinapod.mypressonline.com/how_to_solve_radioactive_decay_problems.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • https://cdn.sqhk.co/vigomuraguf/pgiSVZW/kozenuxumabiwoto.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/9909448038.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/4jbx5hT/super_sergeant_shooter_2_g55_co.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/vector_mechanics_for_engineers_statics_dynamics_9th_edition_solution_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/XmttoJ2/gidesoj.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/96630513637.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/gaxuremewuger/hays_singapore_salary_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/75374578310.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/oraciones_en_pasado_simple_con_verbos_irregulares_y_regulares_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/reptile_and_amphibian_care_sheets.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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 5376 bytes
SHA-256: 824ee44612f1723919c969d9ec50a2179b2784a7d15a50db39ff1e600c8a1879
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 10268 bytes
SHA-256: 48b0b7a7c6573c3f9bbe3ed1ac216edceaa8eae8d7d7eb66928b0be1c9707e87

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