Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63dd9cc3f5aca89…

MALICIOUS

PDF

78.3 KB Created: 2021-03-06 00:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4348c6761b4f113dec4581108b14cb65 SHA-1: a0092162355454698b9928de9b24d6e24d646d5c SHA-256: b63dd9cc3f5aca89813dc8d004709f4f3d96493f3ddff9c8f28a6489c86db49e
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=the+darkest+minds+book+1+summary PDF link annotation
    • http://vashobereg.com/corrupcion_en_la_administracion_publica_peruevhnb.pdfIn PDF document text
    • http://sweetygirl.club/25907154850cja0d.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/famamefewotuzigam2ll3t.pdfIn PDF document text
    • http://joblanc.xyz/cerere_preschimbare_permisq22vz.pdfIn PDF document text
    • http://lg-copyrightforms.com/27469090889uirt5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fd7e594d6be6.pdfIn PDF document text
    • http://salet.store/battle_realms_3s73z1.pdfIn PDF document text
    • http://introdom.ru/understanding_mental_illness_worksheets9qf3o.pdfIn PDF document text
    • http://paktum.pro/ejercicios_de_problemas_de_ecuaciones_de_primer_grado_para_imprimirym6l5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_601433d9cd5a4.pdfIn PDF document text
    • http://tacfitproducts.com/thousand_and_one_nights_restaurant_beijingh3yzc.pdfIn PDF document text
    • http://mediaverifiedbadge.com/55081210059qn7gy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_6003fc6b0c4dd.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/rodiligarexo/baxofememesare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331f4927-028a-4ed2-a0ec-f329a5c3a46e/hp_officejet_4500_desktop_all-in-one_printer_-_g510a_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ac73d0-7c8a-43dc-8c2c-b5a91bca8404/bosch_dishwasher_silence_plus_46_dba_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99793b1c-54bf-45e3-95c5-371aa7d03d5e/what_is_the_molecular_structure_of_water.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/calidad_educativa_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbcd739-4525-485d-92d3-c7eea7f95725/4837706291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ff93d5-5edb-498d-ae01-f3949324de64/psalm_23_commentary_matthew_henry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203f56b6-967a-4786-9bc6-2a3fda9bb6e4/excel_formulas_not_working_when_sort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b37ca1d-03c9-4df9-95d7-8796fffec84a/employee_performance_self_appraisal_answers_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e76506-03a8-4b15-ad35-6ea3af598fa0/magnafuel_prostar_500_rebuild_kit.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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 5340 bytes
SHA-256: cb8ce04fc8e48c7606d1dfb12e1b82b5b0892e90675f82de7d865459f1daa766
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 11200 bytes
SHA-256: 6ed5aa245bb3d4d6057bc373d1e626d939ed1e96ea657e9ee119e74da8a8fa66