Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c54c25cdff87f…

MALICIOUS

PDF

82.8 KB Created: 2021-04-07 10:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0d146228a48c338dcf583e65bb9d3ec1 SHA-1: 618819567e1f4495072726cb617d985ead13ed5a SHA-256: 9c9c54c25cdff87fad86c22b6e924a1ff0293b588b736d1ff87a5e8ce8f71b90
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a credential phishing lure, specifically impersonating the 'Target' brand. It contains numerous external URIs, many pointing to disposable hosting, and one critical heuristic identified it as a brand-impersonation credential phishing lure with a link to an abused redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and associated URLs strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/noteriwemurefob_daxuv_jadumadat_jebenalewa.pdf.
  • 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://maypoin.ru/strik?utm_term=information+security+policy+pdf+bank PDF link annotation
    • http://wotukujis.sportsontheweb.net/fruit_cocktail_recipes.pdfIn PDF document text
    • http://rupuvuk.22web.org/sbi_bank_syllabus_2020.pdfIn PDF document text
    • http://zoradiwa.iblogger.org/odisha_govt_school_holiday_list_2020.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/noteriwemurefob_daxuv_jadumadat_jebenalewa.pdfIn PDF document text
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/simulojekosujar-gomuw-sobuxitimizabor-lutobivijuvez.pdfIn PDF document text
    • http://kigadotezolesun.mypressonline.com/after_series_book_1.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/736860.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/40ec5604.pdfIn PDF document text
    • http://jorodija.iblogger.org/ahsanul_hidaya_vol_13.pdfIn PDF document text
    • https://zakemobuka.weebly.com/uploads/1/3/0/7/130775752/4905bf331c.pdfIn PDF document text
    • http://zinusefubowewet.22web.org/vidmate_app_play_store_computer.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/collins_vocabulary_for_ielts_vk.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/baseline_risk_assessment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e72e5d-4350-4619-b8a5-7bf443ad85b0/how_long_should_you_study_for_nclex_pn.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/bepobaterewetuxadiluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe3f7f9-b443-42f6-b6a3-6938cd1d91c1/edexcel_a_level_biology_student_book_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/78133472338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbba7e7-6fb1-4a5c-8922-ac5ef6dea9c9/katozitudesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6a13f0-63d3-4866-a4aa-00e0a8917c8e/what_questions_to_ask_in_an_executive_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/evali_cdc_report.pdfIn PDF document text
    • http://xonolori.atwebpages.com/16972624901.pdfIn PDF document text
    • http://zodumokosijupe.epizy.com/rubovisa.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_081af2ef925f44cfae6f8d6fe51e9927.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_c0a3b39dc4de4cf58637354e9d525d5d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 5544 bytes
SHA-256: ca119ca6c4681d381d418fbad4cc85422434597802ee40d4540f2408fb018e3b
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 10696 bytes
SHA-256: 86e1714200a8561c5957c0dcfdf56390514def261402ee83f1ec8c5b61294216

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