Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa636c1ad9dd473c…

MALICIOUS

PDF

82.5 KB Created: 2021-05-25 02:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef67e89586a598658796b88878a60d63 SHA-1: 71e43c177117b5443b73800e19624bb7579256b2 SHA-256: fa636c1ad9dd473cf7446edeeba4410ba797bd811e506cf176ef8242551501ee
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=how+to+calculate+power+factor+from+kwh+and+kvarh PDF link annotation
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/27004a.pdfIn PDF document text
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/0788f710.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/7183626.pdfIn PDF document text
    • https://dufanidozit.weebly.com/uploads/1/3/4/7/134764520/1567060.pdfIn PDF document text
    • https://jogofevizu.weebly.com/uploads/1/3/4/3/134348232/7713803.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/zumezeviwakiz/15324615268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f7f7ec-1e11-44fd-abc2-7661d3e30b36/el_nuevo_houdini_in_english_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717e4700-9c5c-4c68-8a9d-a034c947b1fc/jotixavenu.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/jefab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56daa40-744f-4e4e-b238-af9daf689731/data_structures_and_algorithms_using_c_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a53d3d-9273-4209-ac68-77092b9ec981/icloud_photos_not_downloading_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb70401-2135-4183-81d9-8426c0d96dca/kitchenaid_artisan_stand_mixer_model_ksm150ps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df295b-9b86-4be2-a321-98ee94c3be5c/calendario_del_puebla_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/google_maps_javascript_api_directions_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a857ae-4aad-42f8-bafe-04140e3793c5/pobadixasefinor.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/angle_of_repose_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e389758-7df9-4bb3-9ea0-65830ef26b07/harry_potter_and_the_deathly_hallows_plot_holes.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/chick_fil_a_job_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49342ef8-c569-4b68-96e8-94fc7b673886/mito_de_la_caverna_de_platon_comentario_de_texto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb2e103-d80e-44b1-ad79-3ed590eec13f/34519876798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c4bb04-94bb-4b32-aa75-fb871a0f34b1/collins_reverso_dictionary_spanish_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3006df4c-4c00-4e8d-b7aa-72a4609d4cae/38259417159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d1b676-da09-4f36-806d-2be1180567c1/computer_networking_vs_information_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/relational_database_management_system_tutorial_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/line_6_spider_120w.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_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 5396 bytes
SHA-256: 7aef4d9c5c3bf94b4661433544aa036efc07432fefb2a6a05a4a19649e72dbab
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 11172 bytes
SHA-256: c997a2259641df5f8ce2ccc1f9244c5047410764f14dd0b117c8738a47d70ffc