Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca49ff801ce03dd5…

MALICIOUS

PDF

72.0 KB Created: 2021-05-04 01:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d99eda36a84680efcfc9da42c514ed9f SHA-1: dd43bd9907b8fca12abb100707aead10e5f4218c SHA-256: ca49ff801ce03dd51dbfd2850949c8b3dc4ce88f06d04bb9c0525cd327fa6b96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://crophysi.ru/strik?utm_term=kubota+v1505+engine+rebuild+kit PDF link annotation
    • https://cdn.sqhk.co/gevanadu/augjgjl/27889019954.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/xzWihhb/chat_game_app_ios.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/can_b_positive_blood_type_eat_popcorn.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/XZhfgcZ/hello_kitty_cafe_los_angeles_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/h9ieias/jopuvokorifijupav.pdfIn PDF document text
    • http://vexizudu.medianewsonline.com/bargaining_for_advantage_richard_shell.pdfIn PDF document text
    • http://tufinanegonaj.medianewsonline.com/35963200193.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/business_english_lesson.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/h9f6Pug/pakistan_best_chat_app.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/attendance_certificate_format_for_college_students.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/soil_bulk_density.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temolujipu.myartsonline.com/carpentier_s_reconstructive_valve_surgery_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df5448-1970-4118-8176-4ca7222cf651/josadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552db0d0-ff86-43c6-a46c-7f5f856c124d/jogopamug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2ecfd8-84cf-43c5-8541-af5a21dac884/jovolutolazijozuredatewit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3770a846-f6aa-4f7e-9820-85d43585c806/what_is_the_exact_meaning_of_dating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350624ca-3a29-43e2-881d-32a4c8f921be/9712198263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3a4ccc-c5d1-4c9b-adc8-bbdb4f8fdae1/sevixipujigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a0a936-1a47-4f4a-a63c-dc4e922068b0/fit_for_life_book_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caff3aa-6be8-48db-b8e1-001f32f9ff26/59776691691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1ff9a6-a405-4b92-b2d1-5ff7312a4096/41675206803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb8c843-69b0-4277-bf28-b76f0f2a5d8f/panasonic_phone_manual_kx-tga410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f60b11-f098-4ae9-b684-9f53d5985c60/repabowemalikituve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa302992-2f90-445f-aaab-022651b8feae/sefenebevivaremugepe.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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 5364 bytes
SHA-256: 3edeaf7ba70de1f830daed161cee04d04be8f4a3866fca5b5008f9b8060f598b
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10960 bytes
SHA-256: 88688ec3f8d21da212a68e66fa11841925b100d7af671401a8f6945021e06142