Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c734840f9b2292…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 21:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 24d46ce6188374977a1b8eded12eebe8 SHA-1: 59252379739e30d7b2c85e50f62e8cf7c138d5e7 SHA-256: 02c734840f9b229207060978b728af622fdecdf874e687f61b940155dc03d37d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded links are indicative of a spearphishing attachment 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://vilenefex.ru/award?keyword=latex+article+example+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff6941dd078.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/cementation_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb347d38cfc.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/toeic_barron_download.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/casual_leave_application_form_for_central_government_employees.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/jaWGjjC/war_of_the_worlds_2019_robot_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hbkjbhg/palikuv.pdfIn PDF document text
    • http://xinupavob.iblogger.org/noxerokajokiposemep.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/fbhc1jb/among_us_character_creator_picrew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_60071446cc915.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/g1tWjhs/word_search_solver_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_603e8bb380673.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/jbghRhf/pokemon_sun_and_moon_tv_show_cast.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/present_tense_stem_changing_verbs_spanish_worksheet.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/mugabuguneruwoxaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/amadeus_commands_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/baby_head_deformed_after_birth.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/97196146613.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/big_data_python_tutorial.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/85750284548.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/domonobitaliwegisawusixu.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_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 5132 bytes
SHA-256: bbc98806283a876bf06cd2d32b66c279688dd515ed8eb63023b20538a4b24e73
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 12592 bytes
SHA-256: 336af3bd0353b60013b631c48e400db952cf2121468265ab92202c3bc99921df

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