Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ad5964a0d4a450…

MALICIOUS

PDF

78.9 KB Created: 2021-05-11 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38d2f5c7ca135481d702a2aa2c2e53b8 SHA-1: 3e49ab24ab70946e5ca501f8a016b072bdc493e7 SHA-256: 24ad5964a0d4a450b644f1c78467061085b51c035d199fd520f87ffd119fc167
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=best+microbiology+books+reddit PDF link annotation
    • http://xuvaguwanolinu.66ghz.com/flammability_test_report.pdfIn PDF document text
    • http://olx-delivery.cc/adding_fractions_worksheets_5th_gradenz3t8.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/fubibikig.pdfIn PDF document text
    • http://ooovseanalizi.ru/chrissy_teigen_cravings_27oogo.pdfIn PDF document text
    • http://aov.one/68833169085dpcvw.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/0e855520690b.pdfIn PDF document text
    • http://paganel.world/475328824680yybz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601fd49c92eee.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://pujatafar.weebly.com/uploads/1/3/4/8/134854232/bezijupis_fusafosotofoj_reropidorakaka.pdfIn PDF document text
    • http://deutschebank-meine.com/guduvodekoxuzeav.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/d49b5d15381d2.pdfIn PDF document text
    • http://nesadurem.22web.org/amar_o_depender_audiolibro.pdfIn PDF document text
    • http://moneymaya.site/fitepewagizuviwakodagoka612ql.pdfIn PDF document text
    • http://insitemonitoring.com/nickelodeon_basketball_stars_2_unblockedytka8.pdfIn PDF document text
    • http://befigter.xyz/what_does_gnosticj1shq.pdfIn PDF document text
    • http://1-bog.ru/beeman_rs2_air_rifle_manualimatm.pdfIn PDF document text
    • http://regvoolkim.website/80207859695k3gyu.pdfIn PDF document text
    • http://good-production18.site/fuwigi3p7yu.pdfIn PDF document text
    • http://kino-vezde.ru/tupewakegia1i6o.pdfIn PDF document text
    • http://nuduxebevevewu.22web.org/free_download_contoh_surat_lamaran_kerja.doc.pdfIn PDF document text
    • http://jumpfs.space/17076307269fjth3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fd613ca2a83a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kimejuj.rf.gd/terapi_behavioristik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5084 bytes
SHA-256: e85ddf8d8a8806d6115e04cd51d083d6fdef0247ac1bd66f0b71342ffdf645ad
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10516 bytes
SHA-256: 8dfae537ac6c3f7f9d34bb508b7f15356722f43a3577a7308ed9f4a3736eb623
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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