Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d0a7827add35ae…

MALICIOUS

PDF

81.5 KB Created: 2021-02-21 22:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21d1bb5f1d563ed01cec440846e20d77 SHA-1: c377b1c96e72a26002bc1cc40f78fe32c44ca545 SHA-256: 65d0a7827add35aedbb12f8f2c5aaf43bb61ce509234da68b47878c71aec0119
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, disguised with a lure related to downloading a 'Willy Wonka' soundtrack. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=willy+wonka+and+the+chocolate+factory+soundtrack+free+mp3+download PDF link annotation
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/c10a56bca62d.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/SthcWjj/western_hills_motel_bowling_green_ky_42101.pdfIn PDF document text
    • http://usacreditreport.info/dishonored_2_well_funded_trophy_guidevqq4i.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/gAoiaig/lord_of_the_clans_book.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/fopikekusiked.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/dd3jbWs/56415205075.pdfIn PDF document text
    • http://gigazukiwizave.22web.org/64748266748.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/baliluxadokilezofif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_602905f243f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5fd18d582b180.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/7aa43fdd1e6.pdfIn PDF document text
    • http://znasila.ru/ese_per_pushimet_dimerore36vjv.pdfIn PDF document text
    • http://cenderaoriginator.com/grade_1_colouring_worksheetsnpdum.pdfIn PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/ed3880acd670.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/hicOjju/44178049536.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafakizukizunof.epizy.com/luluzawum.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/basic_english_usage_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/rujexuregijivirudun.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/50705910016.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_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 5832 bytes
SHA-256: 8674c45cb58b8f01bc13395bd26bf39871d58017ef5ca2a41f742934b63a6a98
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 12368 bytes
SHA-256: 3cf749b672bd75294e07a98902161816c8968bf521241175f626817404c8a8d9

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