Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ce7e06ae0651c9…

MALICIOUS

PDF

75.5 KB Created: 2021-03-03 19:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1156431ad8e5f5015c96f886d3e242f0 SHA-1: 5a4ecc1bade959a7b428ff42fa7cb83590c48c39 SHA-256: a7ce7e06ae0651c9d7e958276e0a66ed6556003f3bb0b0232e84cf8220cd6e1e
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://jacksth.ru/strik?utm_term=can+you+program+arduino+with+python' indicates a potential lure related to programming. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=can+you+program+arduino+with+python PDF link annotation
    • http://janafan.scienceontheweb.net/is_he_dipole_dipole.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jhaihTI/27760752321.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/QygjeED/teacher_assistant_test_practice_california.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/Wggihij/48878248464.pdfIn PDF document text
    • https://xobopigo.weebly.com/uploads/1/3/1/4/131437845/vipiroraka.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/mutiwel.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/descargar_tipos_de_graficos_para_excel_2010.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/xiravurewabuvenizenaxare.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/gdkkijg/cube_escape_paradox_chapter_2_statues.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/eb1yms0/xebodugezoborotilafo.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/47068307137.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/gdrfhaL/hooplife_basketball_academy_little_rock_ar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/livro_raizes_do_brasil_download.pdfIn PDF document text
    • http://mojefujal.rf.gd/29911381110.pdfIn PDF document text
    • http://xirasajizobopa.rf.gd/gift_voucher_template_free_psd.pdfIn PDF document text
    • http://fasilew.epizy.com/bmw_z4_2010_manual.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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 5264 bytes
SHA-256: 10809c8715cce5253533b709b089d1829610f9ed1346bf4542df557be52ab720
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10432 bytes
SHA-256: 9a3ee9a3a125f3c392628fe751d9230cf93011af9497a419f65ac3ab289ec884

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