Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e655988d282b24…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 20:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 62b77efe1f8a039bba521f7a80b7d792 SHA-1: dd87fccad797d3acd230762d97025dbeb70393ba SHA-256: b1e655988d282b246b8afa35d0e9877cc7486cb01db66673313e1935626c2c6d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, 'https://resalured.ru/strik?utm_term=east+of+eden+book+sparknotes', appears to be part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=east+of+eden+book+sparknotes PDF link annotation
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/pobidanevu_firuvufewoju_pijusetafop_wifezagesajore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_600afa31268d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_6002e459287f8.pdfIn PDF document text
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/dumajibuvad.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/gofutub.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/cuanto_es_5_11_pulgadas_en_centimetros.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/barriers_to_effective_communication_definition_and_examples.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/47399010371.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/dejojesimosi.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/the_real_book_6th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500677/normal_5fdf6dbc8f3d1.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/bosch_silence_plus_error_code_15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_6039717d4cfa0.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/the_maze_runner_movie_ending_explained.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_a718a90fcc0c43ae86662634d21bdf96.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_2c3fd346ee5147d08c0c55381599d59f.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/what_to_study_for_a_drivers_test.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_8db77a2110f94c3ebba1f1ec7020143c.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_7d1e260eac3c40f9bffa95ef83a68586.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_014937fb5892474895c19d276fb3e844.pdf?index=trueIn PDF document text
    • http://dapibudajemuk.atwebpages.com/citizen_skyhawk_titanium_replacement_band.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_84f96fb027b444638f755d14b80666c6.pdf?index=trueIn PDF document text
    • http://pefimubis.myartsonline.com/vidof.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_27636aa1ce3241dcbbad5b46b40e6155.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_935e193d3e95487a9dba3b6b6e541085.pdf?index=trueIn 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5164 bytes
SHA-256: 664115c6c962fc4af3fef866a8ce2b46c6210824f2362bd003e09fe090c09bf3
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10492 bytes
SHA-256: 874cccc549f707657cfbee59764462c54a961238efafd8444bcb4bbba9f15f72