Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f71c39cfc18acf…

MALICIOUS

PDF

82.9 KB Created: 2021-03-24 18:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8a909820e5f10e40bfae599054696cb2 SHA-1: 2baeac3bee87566e1e99c8e985cfa5a69338c4aa SHA-256: d4f71c39cfc18acff9c24555195ec3443a6069f0c3d75840795c684e58030af7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious websites. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=is+kakashi+the+white+fang PDF link annotation
    • https://cdn.sqhk.co/borefigux/cqjjMWr/dining_room_furniture_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/mp0jjbk/pakikawegoriputanu.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/BhhjSja/fulubifurofowilezisatojiw.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/union_budget_2020_speech.pdfIn PDF document text
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/975bb.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/2394070.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/jgdjUhd/slot_cars_1_64_racing_sets.pdfIn PDF document text
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/5315876.pdfIn PDF document text
    • http://puveduxorapuba.iblogger.org/larizuxuxufuxa.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/6692539.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/OvVjcgi/m_e_handover_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/8giriht/purexat.pdfIn PDF document text
    • https://cdn.sqhk.co/rugugojeba/ghWYQoY/die_together_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51328e58-fca2-4dcb-9c12-b78283e960f0/ejemplos_de_cada_inteligencia_multiple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d0d504-554f-4ff8-8e7e-892b7af64c3b/pibawanowofibipekul.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/numerical_reasoning_test_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b11015e-051b-4b91-8225-fc16f802d205/example_of_topic_sentence_and_supporting_ideas.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/sokanedaxekobibar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 6896 bytes
SHA-256: 2a74a07a5ad496d15cfb7e024f19f04afb0467db149d31ac62e4d20b6680ecf2
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 4992 bytes
SHA-256: f773aee20c5bf3a8be81c7a5dd6cde60b5027089df060d170b538ab8ae0a7622
font_02_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10956 bytes
SHA-256: fbfe97c9612825512a09be59ae623af6029a67266597ada81c9765691de8db0d