Malicious PDF — malware analysis report

Static analysis result for SHA-256 0510abf111337f9b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 83ac15a240f40a998c92c60328d9aff0 SHA-1: 764d2af8a5fc1e65772da7f370bde594ebdb5524 SHA-256: 0510abf111337f9b82d563ec9ee8c7f275b0b5c1e76e1e5010e345e5b5f828ac
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links strongly indicate a phishing or malware distribution attempt.

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://leonvi.ru/strik?utm_term=stock+market+futures+for+monday+april+6+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426059/normal_600efd3dcffa7.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/evOighh/50000741152.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fdd3c39ed345.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/rBWqmha/small_cd_radio_cassette_player.pdfIn PDF document text
    • http://kasyanbeauty.com/32102729964ian0l.pdfIn PDF document text
    • http://vpntop.info/28994193560s14t9.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/nuweloban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_6021a4babb479.pdfIn PDF document text
    • http://mignonette.space/formal_business_email_sample0q2fz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_6003604631d15.pdfIn PDF document text
    • http://digetipesiri.22web.org/aptitude_test_for_class_9_cbse.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/DibbdSo/candy_legend_java_game_download.pdfIn PDF document text
    • http://allostar.buzz/hillsborough_county_public_schools_electronic_report_cardsl3zwt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fde07612d537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopapaxejoj.epizy.com/collecting_memories_wow_guide.pdfIn PDF document text
    • http://lavewas.epizy.com/apache_tomcat_version_9_free.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/aadhar_card_address_change_form_english.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 6000 bytes
SHA-256: 1382b87edb5d4a2780852fdb479415d56cecb3f99e393a1ebeedcb470f625fa7
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 11124 bytes
SHA-256: 6e8b2fc3d14c1f8c272e9f0428b2a20aa495d397389fb8427ad2fe6388ca9dee

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