Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aff5162dd7b643a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 23:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41dec03fa02bc25815e8c5b3131c4569 SHA-1: dc00e954f2fc45295b1d5a6ea6dea373fa243a61 SHA-256: 5aff5162dd7b643abfec41a3a65787c2e8fcbb1aaba6eae042af65a4b93d4994
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to redirect users to further malicious content or download payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=les+mis%25C3%25A9rables+movie+original
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/89265f8.pdf
    • http://pedumerik.sportsontheweb.net/grade_8_algebraic_equations_worksheets.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/lalexikup.pdf
    • http://xafesuvorolivig.scienceontheweb.net/xosamerugajape.pdf
    • https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/mededowazav-vuwapimula.pdf
    • http://sazasebum.iblogger.org/58817245749.pdf
    • http://litvinenko.xyz/best_free_wordpress_themes_for_blogs_and_ecommercexijce.pdf
    • http://predouche.xyz/18283787755hmikt.pdf
    • http://zelumefepa.sportsontheweb.net/xotewunidipevu.pdf
    • http://stalekost.site/ue_megaboom_instruction_manualw55er.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_e9fb7c7dfc4a4d2b8b4f4459b72af203.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e919a86-b4fe-44e2-80ce-2976f11333aa/city_of_lost_souls_cassandra_clare.pdf
    • http://wedinuvudazoxo.rf.gd/12689022905.pdf
    • https://uploads.strikinglycdn.com/files/928faa51-98a7-4a5c-990e-4636969c3234/how_to_setup_your_pole_for_catfish.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_03e6d54e7191418287060a4f7093a306.pdf?index=true
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_be9882b7262d49cb8b076425a371ea37.pdf?index=true
    • http://xovefopu.myartsonline.com/punctuation_worksheets_ks2.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_36537647d36f4c0e8d557abb5ca2c4c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50a0a631-66bd-4bd2-87bf-243edc2f9952/praxis_plt_7-12_practice_test_free.pdf
    • https://uploads.strikinglycdn.com/files/bd66fa17-38fe-4ccf-a81f-c4f68e96a80d/journey_to_the_west_full_movie_in_hindi_dubbed_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa37.bin
98c25d8219b2ae9932169ba925a2dc7ccd004e7bd9134af84ecfa371b8e47945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5288 bytes
font_01_sfnt_off00010be0.bin
993730d0cd554ad154ff6d516f9275b8cda4d3e78ed0de5ce0115e8d086db552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11028 bytes

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