Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ee791120b419d…

MALICIOUS

PDF

87.9 KB Created: 2021-04-08 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 45655f573c444e361682ba4a1fcac667 SHA-1: 101432c3e13be07d879bd06e1de52f1965997f80 SHA-256: 958ee791120b419d6450b0311dc7b162f86e2e9804ceed8c9fd81f1799b1503d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=rampage+v+extreme+memory+compatibility PDF link annotation
    • http://megopoveguvujal.medianewsonline.com/87725711658.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/jovigotun.pdfIn PDF document text
    • http://dubaxerunonafu.iblogger.org/cours_d_orthophonie.pdfIn PDF document text
    • http://kefitetapirep.22web.org/serology_test_procedure.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/rrb_bank_syllabus_2020_download.pdfIn PDF document text
    • http://taxarigi.sportsontheweb.net/canada_child_passport_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipesijelu.rf.gd/pnrc_gnm_2nd_year_date_sheet.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/aptitude_sample_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/verujewem.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/97736338095.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/body_temperature_chart.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_ff4da816aa6d4c01bae3cdb96bf7bd69.pdf?index=trueIn PDF document text
    • http://jefesati.rf.gd/94027979403.pdfIn PDF document text
    • http://zapusov.atwebpages.com/fulifukemerewawe.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_53eb8eec200f4dcc8f4b8bdb4c45aabe.pdf?index=trueIn PDF document text
    • http://setewexevevel.epizy.com/bronto_platform_saddle_cheat.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/86709617306.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_e0b657e8b10e4d80b0bb20c6a6dcb69f.pdf?index=trueIn PDF document text
    • http://jowosos.myartsonline.com/rezabefos.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_e98a7aa7de404f60916fa8565025fe35.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_a7bc6b2c1aff43e688cffb58f7f4945b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 3016 bytes
SHA-256: 07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1
font_01_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 5452 bytes
SHA-256: 02691540803aff0bd94e3a57a06284007b7447e7d2dd1fc4a9d0da96df7616b3
font_02_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 11796 bytes
SHA-256: 5c8161fc60b264442b85365c2c51fb196c08296c3ad8a5f42b30e22407a13fe5