Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f438e21de4c8e4…

MALICIOUS

PDF

68.1 KB Created: 2021-04-15 06:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93d1cb386c55ac9362d8b9605559d5df SHA-1: 1e5c9e02c7f3f389c7ba99a00a9ff6da3528beef SHA-256: 95f438e21de4c8e4cbccedb26ad3fb3e3eb0e25ffd2c9507159ef74b69407ba2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL related to printer cartridge refilling. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=how+to+refill+hp+deskjet+2600+cartridge PDF link annotation
    • http://wavarev.22web.org/book_to_read_in_english.pdfIn PDF document text
    • http://buybritishcat.com/tuzufufuvalojovuxzy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ffd69af55a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6041c88b69d3f.pdfIn PDF document text
    • http://vsspb.ru/jidomiwodinejijuvifudaa4t7w.pdfIn PDF document text
    • http://axacheat4.xyz/megacraft_pocket_edition_descargarrsr7k.pdfIn PDF document text
    • http://rumajasajobotod.iblogger.org/lixapedobaxotel.pdfIn PDF document text
    • http://reawolt.online/bujarekasenatabomup0pslm.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/zumobogux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6022bbd632627.pdfIn PDF document text
    • http://tehnikator.ru/60297131962t3q4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_604e994f12d14.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/verifica_analisi_logica_seconda_media.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_606d31f2c28eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufeguwopox.rf.gd/vomaworopotufupepul.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/zojavugivejasizeladawikut.pdfIn PDF document text
    • http://nuzuxuzenexeku.rf.gd/windows_7_keyboard_shortcut_move_window_to_next_monitor.pdfIn PDF document text
    • http://xifabopopotesa.epizy.com/94207602162.pdfIn PDF document text
    • http://fibogexexagiram.rf.gd/duxufowajagidomowozez.pdfIn PDF document text
    • http://tumurubulofomam.rf.gd/69621910411.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/what_is_knowledge_management_software.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_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 6040 bytes
SHA-256: 4827b2a08df4191e92ff7462e5e1d6d313879f6fa6131585c072d378429170eb
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10592 bytes
SHA-256: bcc124d942e9fc79c54408285ab4fe8ef7479123d65425c86c7af0730b2233b2

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