Malicious PDF — malware analysis report

Static analysis result for SHA-256 2561f0c271567c15…

MALICIOUS

PDF

83.4 KB Created: 2021-04-05 05:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ba1d2349ec26cbf243249001c9b39d3f SHA-1: cbaa5f4c0ca15f7e53c510d8ad4b3c2a58c474ce SHA-256: 2561f0c271567c15c9c1c4ed9cd5b954094842016c5d3c343be6221fd95a00d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/award?keyword=sonda+vesical+de+demora+procedimento+pdf PDF link annotation
    • http://esplus.pro/kung_fury_2015okneb.pdfIn PDF document text
    • http://pabixigenived.22web.org/homemade_bandsaw_mill_plans.pdfIn PDF document text
    • http://leqqurint.online/zobiwugagelapuzcmvk7.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/d3c0d0a.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/8786849.pdfIn PDF document text
    • http://damvglaz1.xyz/a_nice_cup_of_tea_book_by_celia_imriehzp2u.pdfIn PDF document text
    • http://sawezudo.iblogger.org/ansoff_matrix_definition.pdfIn PDF document text
    • http://216tilford.com/saguvuwonagujusin17ej.pdfIn PDF document text
    • https://sujuwamor.weebly.com/uploads/1/3/4/7/134719544/vuleliwokos.pdfIn PDF document text
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/c9d23.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/lutuxema.pdfIn PDF document text
    • http://ezfix.asia/viper_7752v_replacement_case0jgyi.pdfIn PDF document text
    • http://radewilagimalap.iblogger.org/how_to_reprogram_chamberlain_garage_door_remotes.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/b62363d4-313d-4727-8f88-9bfc30f416bb/2853918511.pdfIn PDF document text
    • http://jopatodorijapu.epizy.com/luzojixozetese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0093b82-5470-4d53-ba21-bd3dfd421a1e/what_does_f02_mean.pdfIn PDF document text
    • http://rakenomim.epizy.com/bihar_si_previous_year_question_paper_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5629e585-218b-4155-9393-6adf4f6a5b6c/can_you_buy_and_sell_stocks_on_yahoo_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81eb7fc-6204-42dd-b039-c09a0054471f/human_resource_management_in_india_performance_and_complementarity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c579bda1-1660-461f-afee-239eeeca88d5/how_to_learn_english_for_the_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d19485-1a03-4693-8638-0434af0f1476/mepezon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114eb5a3-7616-4509-8bfd-136141ec3d7d/83907660212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1906b035-2387-45f9-ab3b-dd793a302e9b/isocrates_against_the_sophists_perseus.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 6416 bytes
SHA-256: 2a69545f8a9d104697b847a0f548493cbc920d2d91a2c508c9ca03512f8941e1
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 5464 bytes
SHA-256: 89fcb61d786cf317c8fc3b2adb04ea488a571651f42c837219c230a649345497
font_02_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 13272 bytes
SHA-256: e78a2adf44191382c1968413c959e0655df3b2680e83ee5db9735e656875742f

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