Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c923a23ea3ecf1…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 14:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa13fb2741a458d013de3a8f1ecb07d4 SHA-1: 158fe95a92b9bb279e7aeadfbf74a8d78f386888 SHA-256: f4c923a23ea3ecf13c25d5730a1bc78dafcce32cbe7b2585fe1e4619e015948c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/123?utm_term=life+skills+mathematics+worksheets PDF link annotation
    • http://usesol.xyz/what_are_the_parts_of_a_shower_faucet_calledop5zm.pdfIn PDF document text
    • http://keepsufi.space/fifty_shades_freed_movie_reviewjulul.pdfIn PDF document text
    • http://instapriz365.site/engenius_durafon_1x_battery_coverkaabz.pdfIn PDF document text
    • http://baby-slings.ru/quattro_pro_caracteristicas3kiek.pdfIn PDF document text
    • http://getplafond.xyz/43278685009pkccb.pdfIn PDF document text
    • http://jadebey-x.com/semobesajuxojurilukerej1axb5.pdfIn PDF document text
    • http://ejqy.com/nombres_que_tienen_significados_malosrvusy.pdfIn PDF document text
    • http://keepxufi.space/how_much_does_it_cost_to_reupholster_a_recliner_uk80hsv.pdfIn PDF document text
    • http://copytoshka.ru/80051730160orxt2.pdfIn PDF document text
    • http://wawogofofun.iblogger.org/patotiwo.pdfIn PDF document text
    • http://wapazezaduv.iblogger.org/97909417120.pdfIn PDF document text
    • http://astropsychology.site/aztec_strategy_eu4oydbt.pdfIn PDF document text
    • http://pshcomonhere.xyz/28516679989tcvdd.pdfIn PDF document text
    • http://seplafond.xyz/roxineribufo1ge19.pdfIn PDF document text
    • http://jexurumefatomig.22web.org/83379715767.pdfIn PDF document text
    • http://mosdendy.store/savage_worlds_deluxe_vs_adventure_editiony3qra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasukerubupir.epizy.com/analytics_platform_salesforce_license.pdfIn PDF document text
    • http://gogolozumer.epizy.com/80720517733.pdfIn PDF document text
    • http://vutoxexikuru.rf.gd/toleniwojoxigog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbe7e91-1a20-4a44-b5b8-5d5898cb13cf/gojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f319cfd-1510-42e7-87ef-f0d1d1c43fc3/wapigalabuzobugugibowini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f150bf51-20bd-46c9-aa60-fcf09ea6468d/15956891096.pdfIn PDF document text
    • http://bosirizowu.rf.gd/best_bible_study_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1fcd06-cbf1-4d7b-a8fd-ca49a55fd43d/6023222348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6963e74b-b614-446a-b70d-790985636a42/jejome.pdfIn PDF document text
    • http://kedogevakubonog.epizy.com/ielts_academic_reading_test_samples_with_answers.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5220 bytes
SHA-256: 62be5afc512bd5c431989f203bf1fbf51669f3e3562bafc4e560364274712bef
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10508 bytes
SHA-256: 0a49345b1da913e63abbe04aae438f4896cfe26c9dde45ea3c243283545f5b37

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