Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966a733e122550a…

MALICIOUS

PDF

95.8 KB Created: 2021-02-25 06:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b53018dd38082d753020e6f959294c9 SHA-1: 54b9eb5cc617e20626ec1150d14bc44c8c11b70f SHA-256: 8966a733e122550ae8ce7ac2c8099c9776c398fb8865f5efb7ecab3f5ed2d085
126 Risk Score

Malware Insights

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

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 0.9995

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://druttle.ru/123?utm_term=does+coway+air+purifier+produce+ozone PDF link annotation
    • http://zememor.sportsontheweb.net/what_is_the_average_salary_of_a_chemistry_professor.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/dabewejoxojutemebas.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/saduko.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/what_are_the_top_5_critical_thinking_skills.pdfIn PDF document text
    • http://nekretnine.site/5416321727344ir5.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/1217151907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6033a6ed91f27.pdfIn PDF document text
    • http://ig-soft-team.com/startup_financial_plannerz012z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/chopin_prelude_24_difficulty.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/sales_manager_job_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/which_is_better_canon_a1_or_ae1.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/philips_norelco_bodygroom_series_7000_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/belgrade_tram_map.pdfIn PDF document text
    • http://answers.yahoo.com/question/index;_ylt=Ak0vQIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 23444 bytes
SHA-256: 9382afc0de15cfd99fd7147a0f7917612182659a8f3f36aea586c1f2ebc1ed8c
font_01_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 5360 bytes
SHA-256: 672e26d87fc345dd64a313fc3845a36c6ccff956b0c07207e02084403b5e3527
font_02_sfnt_off00013602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13602 11264 bytes
SHA-256: fca085a03ae5c1753bd832c3afb9f605557e007d6eab9941a60e4c400a265fe6
font_03_sfnt_off00015c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd