Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdf3e9f1abcc001…

MALICIOUS

PDF

85.3 KB Created: 2021-03-19 10:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a8a66a6b795694ac45430f0b0b17d7e SHA-1: 5988f628cc4799178b1a41ef919dd78cef35d374 SHA-256: 3cdf3e9f1abcc001662c47579c80eed0b6414797daff6f0ace9a46353b6b93b5
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 0.9995

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
  • 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://jumiwimov.ru/strik?utm_term=my+yard+machine+riding+mower+will+not+start PDF link annotation
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/5b0658eed4607.pdfIn PDF document text
    • http://rubarenuruvofi.iblogger.org/cash_flow_statement_template_nz.pdfIn PDF document text
    • http://greatholl.com/yongnuo_yn560-tx_ii_manual_flash_controllerx0klb.pdfIn PDF document text
    • http://netewe5.xyz/what_training_is_needed_to_be_a_real_estate_sales_agentvhwtd.pdfIn PDF document text
    • http://webcam-model.online/2004_chrysler_pacifica_engine_removalrupta.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/2903723.pdfIn PDF document text
    • http://nazhivy.net/dajidbfxqr.pdfIn PDF document text
    • http://cheapkeys.site/zelexonivezinixetukuxeflp9s7.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/dffc64ec-ea61-47df-a1c8-6027e5964f00/43001875069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3e9daa-d297-4d65-8cb5-a22ec00ffdfd/naruv.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/vs_2017_platform_toolset_v120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40691ff9-f9d8-4373-90bf-9a29815ba5d5/liftmaster_formula_1_programming_homelink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109d1dd3-3c3c-44b1-841b-785a8a478ff0/excel_vba_find_type_mismatch.pdfIn PDF document text
    • http://zaxitow.epizy.com/68193538971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017067f3-4a3e-4950-bc13-addbad93a568/kamibeso.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/honda_lawn_mower_repair_manual_hrm215.pdfIn PDF document text
    • http://jikokajogov.rf.gd/controles_y_automatismos_electricos_gratis.pdfIn PDF document text
    • http://ruwapebubori.epizy.com/adwords_exam_answers_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b506d2b7-08a9-49d4-8d7f-72aa1d0adcdd/how_to_pause_google_search_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9acc638-0a96-48de-a227-bedb294c8720/zejed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7489c33-364d-40c4-abef-f5467ac67dfb/homedics_weighing_scale_manual.pdfIn PDF document text
    • http://pikegibu.rf.gd/what_is_the_tree_of_life_in_revelation.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_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 5552 bytes
SHA-256: e6a595c20d866f29af8bd79b60ce1740d30b9362287ac7bb3967d4e241c7fd21
font_01_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 11540 bytes
SHA-256: b62cb4d7e46bd02a0af6815ead2aedc42c4346f78cf3b5afb95f4634efff3cc2