Malicious PDF — malware analysis report

Static analysis result for SHA-256 62433f78e2baf8a4…

MALICIOUS

PDF

91.4 KB Created: 2021-03-29 00:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 15ff5183b076021db74bb544b18c75da SHA-1: 9a5075428a6bfb0209ded3374d430ee0f6c185ed SHA-256: 62433f78e2baf8a4fc319abc3870d23bc021585d49f57b5b7075f1cd6c75aac2
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirection and a link farm hosted on disposable infrastructure. The primary malicious link, 'https://crophysi.ru/123?utm_term=monkey+chimp+email+templates', is flagged as a redirector to known malicious sites. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=monkey+chimp+email+templates In PDF document text
    • https://cdn.sqhk.co/nezotelo/iihjcSG/wuranaxifekasadatila.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzijaxab/Pjjgdgi/endless_highway_beamng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ff0639a679ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_6060cf8550070.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/ruvasuko.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/xumudo_rugosusesev.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/estado_de_bienestar_definicion_y_caracteristicas.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/4644123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_601ed817c5000.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/eaFgcij/best_war_strategy_games_ps4.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/rexitaginiso.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/author_of_whos_afraid_of_virginia_woolf_crossword_clue.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/2210854.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/72401.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/eqpsIid/honda_grass_cutter_machine_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/igeQGhh/white_background_hd_wallpaper_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_5fea3af2e0f9e.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/ziwuvijevo/physics_equations_for_acceleration_displacement_time_and_velocity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b255ff4-d3ff-4f4c-98e6-8774c88f9be7/44308505286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84b359c-5ad7-4cf1-bdf7-7be287d888ab/how_to_wire_orbit_sprinkler_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67f4289-66a9-49d2-8479-121a11026678/6603421909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2667386-9b50-45e5-b622-d41a111aa7be/best_us_history_research_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5db5527-63ec-43d3-a78c-5bc01a98c5a6/10628843886.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/fisdap_cardiology_study_guide.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_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 5248 bytes
SHA-256: cdb769690484fffd478facc2d2a615176dbf739583366904470b55560d06b9a7
font_01_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 11372 bytes
SHA-256: 7fb71b22efc07439225d1594c03fb458b906e48da89c681d83b1d010c8020454

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