Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9539c48c4d809d8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 08:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c799731b660f4626ab14657c0e1ef1e SHA-1: 34ef759013e3bc2b5a37371d026825936c6ba160 SHA-256: d9539c48c4d809d84a2fa45b87a56d8f2ab27301551e8892403ea07e75628454
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=the+hunger+games+catching+fire+download PDF link annotation
    • http://ridovise.sportsontheweb.net/does_princeton_review_improve_sat_scores.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/hdD4Tjd/85968795119.pdfIn PDF document text
    • http://it50discount.pro/vovarijilwkfxu.pdfIn PDF document text
    • http://goropefixujifep.22web.org/fivupurujafawobojel.pdfIn PDF document text
    • http://lufosopaxukil.getenjoyment.net/buzurarisubef.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/kiiihgd/90394527123.pdfIn PDF document text
    • http://autobuff.xyz/entity_a_horror_escape_download3pgil.pdfIn PDF document text
    • https://cdn.sqhk.co/gasosivifug/eF2Ghib/airtime_top_up_online.pdfIn PDF document text
    • http://kayikciakademi.com/100_gramos_de_azucar_en_taza_medidoraqwusm.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/hXlG1ib/wubuwarisebuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://totofexux.epizy.com/48_port_switch_excel_template.pdfIn PDF document text
    • http://dejunividote.rf.gd/didafenuvomabosawuguriru.pdfIn PDF document text
    • http://sutekotuluzuwed.rf.gd/logic_puzzles_printable_with_answers.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/dadaponomigugategivi.pdfIn PDF document text
    • http://vodukatova.epizy.com/agastya_samhita_book.pdfIn PDF document text
    • http://jebimotanuz.rf.gd/966549134.pdfIn PDF document text
    • http://baniginoso.epizy.com/geometry_book_answers_chapter_3.pdfIn PDF document text
    • http://dudufimapu.epizy.com/essential_dutch_grammar_book.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/tilixarow.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/dexan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 5360 bytes
SHA-256: 8c6a8bcf68aaf368a7b816191862c21c27289380c0a05b83a6cde7d7b3f3009d
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 11040 bytes
SHA-256: b81139b1f0a2f06491d72b0e6caeadeba4de4e202e6dad082508a12447266b23
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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