Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7c1239879c318…

MALICIOUS

PDF

82.2 KB Created: 2021-05-04 11:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b178b0f4725d9953bb81faa7305ba0b6 SHA-1: edb4a2ed06c6eaa190de9dfa7e7d4cac8fe2eef3 SHA-256: 05b7c1239879c3180f30f46cdc02bf961aa2be9b60dce2e18d952d810e9425ca
66 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm on disposable hosting. The embedded URLs, such as https://vilenefex.ru/strik?utm_term=avatar+the+promise+part+1-3, are likely used to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the document structure and numerous external links suggest an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=avatar+the+promise+part+1-3 PDF link annotation
    • http://sikakapu.medianewsonline.com/network_engineer_job_description.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/replacement_parts_for_biddeford_electric_blankets.pdfIn PDF document text
    • http://dujaliz.iblogger.org/28634981229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_606637e01a962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fec48b26eb62.pdfIn PDF document text
    • http://worodariravo.22web.org/git_command_to_push_code_into_repository.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_60339de038f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_6015af084aff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5ffb8719d808e.pdfIn PDF document text
    • http://xipuxolidumix.22web.org/98710195117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389794/normal_5fdfda8159ab1.pdfIn PDF document text
    • http://wopafopu.22web.org/administracion_financiera_block.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/roxul.pdfIn PDF document text
    • http://lagijiputofezak.22web.org/89385385271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_6007b71b5e6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fd11e1975b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_605143e5ae9ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fulariponazaget.epizy.com/14856621033.pdfIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_07f21d67bdbd4efaa4c453f2b62201ba.pdf?index=trueIn PDF document text
    • https://51fa5ab5-1254-4b81-b04c-93bf5fb5640a.filesusr.com/ugd/a58502_284f7915c1ce46cfb90f5a3228d10615.pdf?index=trueIn PDF document text
    • http://telagivepovadul.epizy.com/oxford_advanced_learner_s_dictionary_7th_edition_free_download.pdfIn PDF document text
    • http://loxupobupibim.atwebpages.com/ibps_exam_books_free_download.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_f2c52dd134d4433a882b315ea64ed45c.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/exercises_for_lower_back_and_hip_pain.pdfIn PDF document text
    • http://mirowoke.rf.gd/karozokiroxem.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_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 5324 bytes
SHA-256: 7bbc1bef106a97e41b6ce5fc063a4bc8962085973cbb5651a77b20b6a14e047a
font_01_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 10452 bytes
SHA-256: 6684ba8b196649ba945ee635bd8c2312f8bff653426ed967fb0d2cba5b83106f

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