Malicious PDF — malware analysis report

Static analysis result for SHA-256 4235233c8d4dbc6b…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 00:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8b4186a44aa400041d1d7046e725b966 SHA-1: b427d714ad5b946d97dfa4e4cf7cdeafc45bbdda SHA-256: 4235233c8d4dbc6b6c91c55285252c5fa3b03523aededa4c98de479ecc16f39e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=wicca+for+the+solitary+practitioner+pdf PDF link annotation
    • http://vikiduxa.mywebcommunity.org/what_age_can_you_get_a_learners_permit_in_arkansas.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/taco_bell_new_items_october_2020.pdfIn PDF document text
    • http://onenature.space/97660844332rx0n5.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/kezisubi.pdfIn PDF document text
    • http://theharaka.online/gojedesakap7lb.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/statistical_rethinking_julia.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/management_skills_assessment_questionnaire.pdfIn PDF document text
    • http://walkover.me/zewomowikefuwiwafovafaxm366t.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/how_to_fix_bose_soundbar_remote.pdfIn PDF document text
    • http://burrrhey.tech/energean_oil_gas_annual_reportx9996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/48364374418.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/1739199342.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/ski_doo_service_manual_2016.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/xaxakipogofip.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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 5360 bytes
SHA-256: 06f2e63d15186b83e2f40e4ebbf486172253d336c2a934f333f22a223dee3db4
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10456 bytes
SHA-256: e57441e7e428aa36924436f6abcc29a7853028d9b5255d654df0e9d10df07be9

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