Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7b5e2bc120e009…

MALICIOUS

PDF

78.2 KB Created: 2021-06-13 12:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e2d1b3ee7b8243dba50fc5a3e96582c SHA-1: e44c62fd2de78dd4523e9c8137330d5015c3412d SHA-256: 4b7b5e2bc120e009ceaed888c20377fb089ab2a08b215da38d1a3a74c8101386
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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
  • 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://catamma.ru/pbw?utm_term=gta+vice+city+install+free PDF link annotation
    • https://xafokevixutevib.weebly.com/uploads/1/3/2/6/132681308/a6d801a93d47e.pdfIn PDF document text
    • https://nuzupodulekego.weebly.com/uploads/1/3/4/6/134615520/60ac638.pdfIn PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/a6753.pdfIn PDF document text
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/tisezakabe.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/rudurejebuvixog-kisaxuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolasotosexu.pbworks.com/f/free_full_movie_downloader_software_for_pc.pdfIn PDF document text
    • http://safubudesowi.pbworks.com/w/file/fetch/145117281/14838257754.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/windows_loader_2.2_2_by_daz_activator_windows_7_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a903939d-d369-4be1-aa31-d5ba030c7f0f/dewalt_cordless_tools_combo_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc7dc47-70c4-4624-aac3-a0e1d41a8e5c/gefigesemusufejosas.pdfIn PDF document text
    • http://jekijuv.pbworks.com/w/file/fetch/145215069/adjective_adverb.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/f/apex_learning_algebra_2_semester_2_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a3298c-6c38-4b44-9712-369f85c7e3df/river_flows_in_you_yiruma_fingerstyle_guitar_lesson_tutorial_how_to_play_fingerstyle.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/flowering_and_non_flowering_plants_worksheet.pdfIn PDF document text
    • http://nukisefel.pbworks.com/f/5639928346.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144528822/50850762944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120620b5-b332-4911-8e2b-5ce3a932761d/walt_whitman_song_of_myself_themes.pdfIn PDF document text
    • http://vezawegafu.pbworks.com/f/roblox_image_id_codes_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad1d6e3-694f-4823-a65f-72603efe27d6/bidagukisuluwavalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ea8bbe-46e4-4c91-b35b-68bd22ba6038/jijakesobifoxefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a22660-463d-49b9-9858-523139d5ac37/where_to_watch_the_mist_movie.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/f/star_wars_the_last_jedi_screenplay.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_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 5068 bytes
SHA-256: 3f927c26394ef00694028b8ef9d7c52524d4aa43a8e2e9339130cf0616a65a4c
font_01_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 11564 bytes
SHA-256: be5221d9a226983ef829afe4aacbb2b513aea677d188eb9451018f3e1bb68533