Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff78b54245166792…

MALICIOUS

PDF

142.8 KB Created: 2021-03-11 10:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a5ef7224f12c4ceacbf3310c9484a8c1 SHA-1: 6e0fa57f4d949ff9159a15ffcc1f5806d13b0dce SHA-256: ff78b54245166792cad6e24267c1f04eb0acbfc2b9ad1e94b69475e6de00a4d6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of URLs suggests a phishing or redirection attack, likely intended to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/award?keyword=ethnic+cleansing+in+myanmar+pdf In PDF document text
    • http://pekokaxa.22web.org/49605446686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60113d196bf68.pdfIn PDF document text
    • http://nawilojobate.iblogger.org/83804444925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fe440ffc241c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5fe79ee491def.pdfIn PDF document text
    • http://zuvinesewuwiz.iblogger.org/rozegaxop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd6778ee3e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_6033c4971b079.pdfIn PDF document text
    • http://xixubitawub.iblogger.org/39598112261.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/bmw_x6_2018_brochure.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/viregujipowuru/mefegexozuvenajunamolasu.pdfIn PDF document text
    • http://tojodoto.rf.gd/business_plan_project_report.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/eclipse_java_ee_for_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/manualidades_con_madera_de_palets.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/canada_food_guide_protein_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/hush_puppies_size_guide_australia.pdfIn PDF document text
    • http://xivoganunew.rf.gd/audi_a4_2016_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554baa34-3eff-4777-b4ee-8975f23b0316/the_book_thief_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c194fb1c-e862-4e97-ac26-26c679c98a18/wiat_qualitative_descriptions.pdfIn PDF document text
    • http://dugipiwem.epizy.com/padolusotuze.pdfIn PDF document text
    • http://gevowurarabaj.rf.gd/keynote_material_design_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716613bd-ba14-4ab0-a98e-46f45b51f031/22863202198.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_off0001f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5EF 5628 bytes
SHA-256: 5bc106ed9504eda0aa60fbf39a4ed9d2e9078368c41a78ebb05b15c09eec990a
font_01_sfnt_off000208f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208F7 10460 bytes
SHA-256: 565e9d9a4c047e4bb04f7d9d6234c4eaddde0118ea82a0b1e59a268cf33088d5

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