Malicious PDF — malware analysis report

Static analysis result for SHA-256 86919164fcdb45d9…

MALICIOUS

PDF

85.1 KB Created: 2021-03-10 10:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6341a781c8ff53eeef43666ea96a4330 SHA-1: b03405cb33abc738f88b39178a20c3668cfc0648 SHA-256: 86919164fcdb45d9daa297173a6d110f3a3a2b758c57781dc32aa96b800cc8dc
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'fokemale.ru', suggesting a phishing or malicious redirection attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and high detection scores confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/wix?keyword=swfa+3-15x42+review PDF link annotation
    • http://riwotivadejud.sportsontheweb.net/36126754542.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/mijut-wevudelulop-kakifixoso-lominexa.pdfIn PDF document text
    • http://zigodijod.iblogger.org/misunozoku.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/0a8944d.pdfIn PDF document text
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/e85c11c29ba4f1.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/livro_raizes_do_brasil.pdfIn PDF document text
    • http://xiweloju.22web.org/45953935741.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/4217490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupewujivijulo.epizy.com/excel_vba_delete_all_charts_in_worksheet.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_0183a3796cdf4ab9b0ffa61eff0fc463.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_df70298612d44e669980f4a93aa152b3.pdf?index=trueIn PDF document text
    • http://nipovowegase.rf.gd/saradizugesi.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/10312370127.pdfIn PDF document text
    • http://toramowajo.epizy.com/5th_grade_math_word_problems_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/can_an_electrical_engineer_be_a_software_engineer.pdfIn PDF document text
    • http://nofegogimulat.rf.gd/battery_base_for_echo_dot_4th_generation.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/95126681267.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/52779012457.pdfIn PDF document text
    • http://gubazit.epizy.com/panelview_plus_1000_battery_replacement.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/why_isnt_my_aux_working_in_my_car.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/faxusu.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/88365213591.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/hangaroo_2_answers.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_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 5468 bytes
SHA-256: 9d8b3b3e7a327b8159e1f4506a743c4a7280253edb578382481fd183128e042b
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 15836 bytes
SHA-256: af267b0b91e71b6d7845858f2fa63aa82d12a276ad6e471c0d3514a935488b85

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