Malicious PDF — malware analysis report

Static analysis result for SHA-256 248e188e495a4964…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 11:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f3a0c58485c81d1b757ce948af0fbf85 SHA-1: 9a5ad05981edeeaf9127c10924cbe99114adbade SHA-256: 248e188e495a496473ac68a3375798c18f2929f105a2aec560c32c844399483d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=how+to+feed+as+vampire+skyrim PDF link annotation
    • http://fisujerekuvij.getenjoyment.net/home_zone_led_motion_sensor_security_light_costco.pdfIn PDF document text
    • http://bizifawidipegib.iblogger.org/50422639137.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/ponapujetanam.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/3dplm_aptitude_questions_2020.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/microsoft_access_2016_requires_visual_basic_for_applications.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/voxibawirov.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/kipezebabewekobuvuzatudum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejademadubo.rf.gd/15467886809.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_1d210a866fec4d7888f0d5dfcb1928be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f28223-3a39-4d9c-87d0-815a931b5a20/convotherm_oes_6.10_mini_combination_oven_steamer.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_1955465d68cf4cc9955e45ef4de049c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f083087-f131-4949-b9a8-48e39d64514e/around_the_world_in_80_days_2004_full_movie_online_free.pdfIn PDF document text
    • http://siripuxem.rf.gd/athens_map.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_a785ac6aa9c24d9ab3c89302e9fbb450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/nursing_handoff_report_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/peburojoxurobudimemuzumi.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/fibinovupetexikoved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebee6724-c6f2-44a7-968f-42f99965ce6e/gejovupakibabodalik.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/arm7_assembly_language_programming_100_examples.pdfIn PDF document text
    • http://fonawemosel.epizy.com/12214313168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8143a9-cab0-4cf7-957d-c45542a407ce/is_a_masters_degree_in_information_technology_worth_it_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc79f0bf-0f2a-49a6-a6e4-a7c9119dd29b/volume_and_surface_area_of_cuboids_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/duxobusalumarufit.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_9d2c52325e42425293e65af85e884e9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/74363824936.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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 5432 bytes
SHA-256: f2c6346eff7eebd2ce08d03b61524f27cefeedbb07575f828895de448644eeb2
font_01_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10632 bytes
SHA-256: cab4504b6bca97396b290fb1544e1c0a1ccc08bd7e717e6e2683b34a514016b1