Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73686eb07eb7af0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5238805514f30871324587513ffec384 SHA-1: 2188dcc783a8ba8f7f42dd544b1414c60e4f4934 SHA-256: a73686eb07eb7af0220e47e0ecd389f32e170641d1105c09844233c27a35076d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/123?utm_term=lions+foundation+of+canada+dog+guides+jobs PDF link annotation
    • http://xisumagogali.getenjoyment.net/apollo_munich_optima_restore_reimbursement_claim_form.pdfIn PDF document text
    • http://pavareginuko.22web.org/5563855130.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jeIJgeQ/66614759366.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/biejjhj/need_for_speed_no_limits_apk_mod_ios.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/meruretufidaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fdbb7b63f472.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/jdFqmja/kawafevisefizubor.pdfIn PDF document text
    • http://perekon.22web.org/genki_1_workbook_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5fc955e02f162.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/hb7Abjb/loophole_meaning_in_bengali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5fe8407145dcf.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/58704930561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatujezore.rf.gd/cardiovascular_system_exam_questions.pdfIn PDF document text
    • http://pevibije.rf.gd/kozodatewinimilas.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/reporter_young_krakw_ul._rydlwka.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/61964773934.pdfIn PDF document text
    • http://puwurivetib.epizy.com/reading_comprehension_questions_for_books.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/bls_certificate.pdfIn PDF document text
    • http://fefomopopokelo.epizy.com/introduction_to_international_terrorism.pdfIn PDF document text
    • http://gotulitedovolen.rf.gd/o_poder_da_esposa_que_ora_livro_de_oraes.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/danby_air_conditioner_wifi_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/donomekakonuz.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/animal_cell_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/9676888684.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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 5220 bytes
SHA-256: 5dcc298419a2a63d02388dfc398185c12fbe997e4db023ac308434b52b1cfeac
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11960 bytes
SHA-256: cb29a12d7a31271ee8a1e6c323a6f23d3cffaf8b31d7b7d21068a1a98c0fceeb

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