Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc2a2f3ea5bc66…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 01:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32cca657255c5934e01598134c83e3fd SHA-1: 3b3950279faae0d084a5ec7e97364b193cc50449 SHA-256: 2dcc2a2f3ea5bc66c2ba904d5de9312ca726130002e9c9c6cd4fb201e99f5021
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=moyer+distressed+debt+analysis+pdf PDF link annotation
    • https://cdn.sqhk.co/vizelupavew/7jejjhv/carnival_games_for_sale_australia.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/4277906.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/6757964.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/35677020616.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/tumofixebapefidanefagipi.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/jgJh1ig/adjective_worksheet_with_answers_for_grade_5.pdfIn PDF document text
    • http://narixuz.mypressonline.com/the_law_of_non_international_armed_conflict.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/sources_and_effects_of_water_pollution.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/7948328748.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/7362251.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/30886408404.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/bjasBii/masterminds_guntur_hostel_fee_structure.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/0d36a7b4bae2f74.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/cZRGjfG/turbo_card_tracking_number.pdfIn PDF document text
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/gunalef.pdfIn PDF document text
    • https://minovenuk.weebly.com/uploads/1/3/4/3/134306780/tozevakile.pdfIn PDF document text
    • https://femoleperatofev.weebly.com/uploads/1/3/4/7/134752505/lifawevi_mivemep.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/Ghjp6id/39250240989.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/13107b415455.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/exercicios_de_adjetivos_em_ingles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4a0be765-1559-4e0c-8b62-ebbab685e2c3/81325775860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb313d5-4d00-4f3c-ac87-7cbd383ed43c/how_to_write_a_advertisement.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/accounts_assistant_cover_letter.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/harry_potter_and_the_half-blood_prince_2009_trailer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 5068 bytes
SHA-256: cf8069fec3d52b512caf4efac373b1a92730e809a533a8df2365cc44775c771e
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10656 bytes
SHA-256: cb330059d6a1ea15306287251ca23b96abd18d8786a7109de52dc6e35af5364a
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230