Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7af1699838ada7…

MALICIOUS

PDF

83.1 KB Created: 2021-04-02 22:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6fdb670782a69388a2206b6ed1a98931 SHA-1: ce163fd2187955252cf826bcdf5b8d37972458b3 SHA-256: 5b7af1699838ada77e5fe3b04f628fd33ea09c95abf332ff5f21fde74d6f260e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to lead users to malicious websites, likely for credential harvesting or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=kaw+lake+fishing+guide In PDF document text
    • http://winatesef.sportsontheweb.net/trauma_abdominal_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/gcNkPig/most_popular_party_games_of_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/ibggjgg/tokenuvusesuwex.pdfIn PDF document text
    • http://clientesdkb.com/37489206148ax1fm.pdfIn PDF document text
    • http://blockhcain.host/lifetime_44-inch_polycarbonate_portable_basketball_hoopw2rmt.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/564626050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nirutavikuda.epizy.com/free_isometric_dot_paper.pdfIn PDF document text
    • http://kodinola.rf.gd/kamasutra_book_summary_in_hindi_with_pictures_free_download.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_9688390878db4d5e81bc20b0b1a3193c.pdf?index=trueIn PDF document text
    • http://jukiwifid.rf.gd/10409090901.pdfIn PDF document text
    • http://lijadudotujo.epizy.com/gerrit_setup_guide.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/software_project_deployment_plan_template.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_0c3961dc8f3e4baa9f52a0583ba9a59c.pdf?index=trueIn PDF document text
    • http://gobonelore.epizy.com/twitch_app_not_ing_mods.pdfIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/algebra_2_textbook_california.pdfIn PDF document text
    • http://pusolegulijased.rf.gd/28620655946.pdfIn PDF document text
    • http://tomulan.rf.gd/10071615823.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_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 5196 bytes
SHA-256: 4bf3d0c4d8b2aba7ad6fafb71e2b43801f8803222831bca3a9573996835c2664
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 11380 bytes
SHA-256: 8aacd99a684475b8d1e83c917760a793ab1f3e142ea04bc990d75f8b57d4dfa1

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