Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87567ff9d07f185…

MALICIOUS

PDF

76.0 KB Created: 2021-04-30 22:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfeee6da667b1b931e05ca6dfefb3036 SHA-1: 128d6814dd4df525b59f0fa11ff6687d7248118e SHA-256: b87567ff9d07f1853fbf81b94b2dffd30e43e2258634be3a6c904dae07d8ad76
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 0.9991

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://seumenha.ru/strik?utm_term=why+can%2527t+i+subscribe+to+someone+on+twitch PDF link annotation
    • https://cdn.sqhk.co/depadukat/8VUjghj/asgard_s_wrath_psvr_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dejojoduzi/IGjchgG/my_electric_meter_is_off.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/RKbjrm9/spotlight_room_escape_hope_math.pdfIn PDF document text
    • https://cdn.sqhk.co/sukeseram/Iibqxja/19348963316.pdfIn PDF document text
    • http://dujopaximejuger.iblogger.org/accumulation_of_capital.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/b1ahfgF/ielts_general_writing_task_1.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/4fd19a28-bb9d-4cc0-83a4-9bf4bbf34c8b/how_to_learn_fingerstyle_guitar_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261ba451-340b-43df-9191-0842c5bcffaf/graphic_design_books.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_747d5b66d8b046389a79cff90fd619d4.pdf?index=trueIn PDF document text
    • http://punegejofuj.epizy.com/vozenebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d9a7f2-db2a-4499-8594-0f46d9b62770/pdf_printable_tarot_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/9001173675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9953ab4-f984-46ff-ad27-1b3c7ed8cba2/sirurexexavi.pdfIn PDF document text
    • http://nujemapamonaj.epizy.com/lg_aircon_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64f6327-d165-4a8f-a0f8-48925f431137/how_long_is_a_number_2_clipper_guard.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_ef7efe358b5545c6a92e52684c7d4868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567276b1-1dd3-4d0e-a7e2-ff34daa919b3/finanzas_personales_para_dummies_vicente_hernandez.pdfIn PDF document text
    • http://nimimetebevazi.rf.gd/administrao_financeira_e_oramentria_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd791be-ddb2-47b6-b4a4-836e6eb81c75/angles_of_regular_polygon_sum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc466264-a6e3-403d-b94e-fdcda894ac80/basic_python_course_online.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/best_books_for_mechanical_engineering_gate_preparation.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_f32cf95fab2c47bf85c01c4ac9497fbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/265af4f5-a490-45ca-8e94-f34b4ccb84c8/bulking_meal_plan_on_a_budget_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/mijiwirezizobavenemedelat.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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 5388 bytes
SHA-256: cfe31b17b06847e1067dcc5a9c659d23d3ea9d167e0e26b7c1e7d15470dc8e6b
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 11080 bytes
SHA-256: e902838f32f5e2f0c2b4c474b7b4478a235e2857690ffead9ab5c8ff24c6153a