Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3da63b64d840d02…

MALICIOUS

PDF

89.2 KB Created: 2021-05-30 19:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57cea062da861f97e0855cce93cb6c36 SHA-1: c39f8eadaaf7d86b4e5fbfddbdbdb1ec55960733 SHA-256: c3da63b64d840d02ade81da65b6ea2dfcc9c28784e062946c0ae44d0380e4102
186 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 6

  • 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.
  • 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=how+to+pick+stocks+like+warren+buffett PDF link annotation
    • https://vesogotupu.weebly.com/uploads/1/3/4/7/134702950/rulilutexinemapuleda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_601f032eb6349.pdfIn PDF document text
    • https://vixamimi.weebly.com/uploads/1/3/4/6/134684805/37aa735.pdfIn PDF document text
    • https://pibogexo.weebly.com/uploads/1/3/4/6/134649935/ec3b100d.pdfIn PDF document text
    • https://juvidefe.weebly.com/uploads/1/3/4/3/134319267/rewovudizade.pdfIn PDF document text
    • https://xelekukoxenafo.weebly.com/uploads/1/3/7/5/137513843/1310548.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/c3446bd.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/murawosodoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_6051048c5ad0a.pdfIn PDF document text
    • https://tadazumagitose.weebly.com/uploads/1/3/3/9/133987040/vonifufodijuro-fejadax.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/1841847.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/tuvilova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1f7946-d1be-424a-886c-47c4379c9425/why_does_my_id_say_not_for_real_id_purposes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fb6d03-5618-40d2-9e3b-a0e514c6dec8/best_resistance_bands_for_glute_activation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a668985-b981-44a4-a543-c21f1f272936/tabla_de_colores_con_sus_codigos_en_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1650be30-b366-4e87-9e3e-ea2cda40ba5d/como_saber_si_eres_un_lider_nato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e13a0b-85ba-4ddf-bd3f-f5e666d441f7/toto_washlet_toilet_seat_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7356d6b-480f-432c-aa40-919dd17f68bc/12935966952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb6e602-32a6-4f88-a407-347bf841c22d/taxaliwuzobobavak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55359546-f790-43c4-b185-b9818d337fb8/70016547845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5aa68b-8909-4b2f-9cbc-1451be570436/how_to_move_the_seat_on_a_husqvarna_riding_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549156dc-1d26-4df2-b0f4-bd309819eee1/sony_xplod_1200w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104f1a22-c0a2-459d-a57c-0425e78426c6/singer_heavy_duty_sew_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8478b6-b0f9-41b1-ac98-7a47d4a9775c/adobe_photoshop_cs6_classroom_in_a_book_lesson_files_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad59f0a-651c-4084-bf29-751d4ba8b81c/cyberpunk_2077_gameplay_walkthrough_part_2.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_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 5268 bytes
SHA-256: e916d43bc6649a7cec33538410cf61a7857d7ed125e6ba6d25aaba6f830142b5
font_01_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 11568 bytes
SHA-256: 40a52575c3315a7dc2ea73e45edd6ddb8e49529d0418f4dd96c7bdd54ee18211