Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2aaa5cfc555260…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 10:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 89e47813b099331f6c5b2fed2d0d2d02 SHA-1: 1d8c6da75c6bde9188e3c67f09a9fabd9736120b SHA-256: 9f2aaa5cfc555260ebc4c88a450e3f935c2cb5df4b1b1b05f7cc368a31fa5225
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links. The primary IOC is the URL 'https://baarspo.ru/strik?utm_term=how+to+use+a+little+chief+smoker', which is likely used to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://baarspo.ru/strik?utm_term=how+to+use+a+little+chief+smoker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6044932478000.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/bR5jjFC/within_temptation_what_have_you_done_album.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/php_rest_api_composertwhxz.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/n1pMyhh/haunted_tunnel_in_san_diego_story.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_60253f32ce941.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/i2hfjhz/4_in_a_row_ai.pdfIn PDF document text
    • http://profaudit32.ru/iron_maiden_blogspot_discographyqmyjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60151c4f22716.pdfIn PDF document text
    • http://1xbet-football.fun/mukexivotodebiwiwodujjqas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6020275947a05.pdfIn PDF document text
    • https://cdn.sqhk.co/liguvikozo/JeUhaii/jharkhand_pds_rice_vitran_report.pdfIn PDF document text
    • http://quickpapp.online/what_order_do_the_red_queen_books_go_in3abkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_604afc24e7303.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/dvjb6MQ/the_solar_system_formed_from_brainly.pdfIn PDF document text
    • http://moresukko.ru/organic_chemistry_reactions_practice_grade_12hxuzw.pdfIn PDF document text
    • http://navaram.online/194854673623zk7z.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/wAibTge/mino_monsters_2_mega_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/iagfLej/black_cod_nutritional_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_601e3adb5d309.pdfIn PDF document text
    • http://pankreatitum.ru/985848730303or44.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/igT8agh/facebook_app_manager_disable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6056f6ce6f23e.pdfIn PDF document text
    • http://accface.in/tevotumitvkxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5fe6c00e56332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5ff530de34c60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5240 bytes
SHA-256: 850739fcc1a4d6c38c36b95e6680f990b3ab8a175953c5da680ab0f01cd241ad
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11380 bytes
SHA-256: 6b153b4e0d75f559292fb43ddebc2fa1cc417a625cf8c6bfb6a55bffb4067c7f

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