Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9010d9a7b0e17cd…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 23:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ea524a028f5d5a6c0ddff13d3a7daf24 SHA-1: 16c37e8a09a8385ee9c77ee4dfe150b9dd1226ae SHA-256: f9010d9a7b0e17cd7351639628e341236b1e60e7f7a3c2d5e75d454f290aa9af
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 0.9996

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://midufefew.ru/wix?keyword=minecraft+brewing+recipes+all PDF link annotation
    • https://cdn.sqhk.co/wogefosa/Kcid6hc/introduction_to_business_textbook_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jhzhhLn/flight_to_hawaii_from_sfo_time.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/bulumibozil.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/110089.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/8121608.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/cunto_tiempo_puede_durar_un_zumbido_en_el_odo.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/salario_minimo_2020_decreto_lei.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ijjeQhe/motorcycle_racing_games_xbox_1.pdfIn PDF document text
    • https://cdn.sqhk.co/ginudaket/gLAmv7V/good_communication_and_interpersonal_skills_in_nursing.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/4305524.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/casio_w-800hm-3avdf_erkek_kol_saati.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/1705454.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/jajjjeW/hangout_meaning_in_malayalam.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/4afd9b75-f933-4cfb-94bc-5d0f73ebfb14/ben_hogan_five_lessons_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a682b8e6-710d-4327-9e03-bbf3920c4a53/hec_hms_4.0_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd5c6de-b182-49e0-8333-712d4595fe30/sears_lawn_mower_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d495005-d925-4544-ba9e-6976d5548c0f/sat_math_section_breakdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4477e89c-3717-45b4-b7c2-c43da04b0e4c/30620507001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855e56b6-6a93-4bd4-b206-e8fe7fef6686/kitchenaid_stand_mixer_attachments_black_friday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faec5d0-a534-4025-99d7-d9fa6f4a6650/48385859179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916213a7-ca43-4a4d-bcf5-ffe2716b3c89/2019_ram_1500_towing_mpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c5afe3-9ad2-4670-8282-bdb101a0b317/interview_questions_and_answers_for_manager_round.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_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 5420 bytes
SHA-256: a286361a680848fbc000064df95e33fc6fff057d1be835c2c988a7f6005d04fb
font_01_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 11372 bytes
SHA-256: 813a5e89f442cbf90b2d69ed2498cacd5def91b2d103071ec2647478bb8fd15d