Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d3fd79d8491116…

MALICIOUS

PDF

71.8 KB Created: 2021-04-29 22:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16b274444b16e8cdcf74d7583a2b15df SHA-1: 791c923a593fe58695400250a07ed3fdea84e6e5 SHA-256: b3d3fd79d849111640e780f66f8afa6a0c1d312b5b49d4e42133711e8c4d0e79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=panasonic+microwave+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424027/normal_606293963adb1.pdfIn PDF document text
    • http://nopopoxozexa.iblogger.org/70608269950.pdfIn PDF document text
    • http://ranking-se.com/finanzas_personales_excel_2020ij3r7.pdfIn PDF document text
    • http://jushq.club/banemoxizonexesar1mu68.pdfIn PDF document text
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/nowafozageverazop.pdfIn PDF document text
    • http://doorstepcomputers.com/wuwafuvupusidirodafinge8d.pdfIn PDF document text
    • http://kusipanos.iblogger.org/95194903363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_601d2edb959ed.pdfIn PDF document text
    • http://komomutuba.22web.org/khadya_suraksha_patwari_report_form.pdfIn PDF document text
    • http://kobasobapina.22web.org/coniugazione_verbo_avere_forma_passiva.pdfIn PDF document text
    • http://cashfree.store/can_you_bury_animals_on_your_property7v0oi.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/mopawaz.pdfIn PDF document text
    • http://koprovk.xyz/fufofeduvotuvidekozipabumauh7y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizafatabeni.epizy.com/cut_it_fine_meaning_in_hindi.pdfIn PDF document text
    • http://kozibitoj.epizy.com/chinese_character_worksheet.pdfIn PDF document text
    • http://dejomogilum.rf.gd/how_to_setup_airprint_on_brother_mfc-j4510dw.pdfIn PDF document text
    • http://xanivuva.epizy.com/warobawogunobinaluk.pdfIn PDF document text
    • http://vopepogam.rf.gd/application_letter_for_a_teaching_job.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/72799303337.pdfIn PDF document text
    • http://zopuvebiwu.epizy.com/eu_annex_15.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/biblia_kadosh_descargar_gratis.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/us_army_new_apft_standards.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 5436 bytes
SHA-256: 0a8e5ac56a93dbeb6d008e06bdf4da9cc763e2478392517904bdd7ecdbcdc984
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 10412 bytes
SHA-256: aaf6183ae7486da6725f2f05c4dff8cffd7483eb4914fb904d120276c7d70e93

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