Malicious PDF — malware analysis report

Static analysis result for SHA-256 73088b27b43ba0df…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 15:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9c478b783dcd16fcde4cb839862793e SHA-1: 6f555e344b20e46f3b8b907574ba0fe0c6c4d017 SHA-256: 73088b27b43ba0df7cb9d7c1f4abbdf931d598d2f118604dec435a8c2a452497
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The PDF also acts as a link farm, pointing to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://deeringbayrealestate.com/userfiles/files/digeto.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/36742785129.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/59228408485.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/38603689673.pdfIn PDF document text
    • https://kimcert.com/E/file/rudapubosiwexilep.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/75426083828.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613255a275959---35704498080.pdfIn PDF document text
    • http://electric-kernbichler.at/70630906274.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/92352613701.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/85985504558.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/vuzilonanebaweripuja.pdfIn PDF document text
    • http://trevorhannant.com/94632423879.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/38597229103.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ca4b46f---lomovevulewemanowitopo.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vulafotadepifir.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/55078340127.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/42458003813.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vivoxararexetowosaw.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/74678545461.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22709440801.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/50017003086.pdfIn PDF document text
    • http://office-agglo-larochelle.fr/userfiles/file/95421780072.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/xadenuxezuwobupazukafib.pdfIn PDF document text
    • https://finliz.lt/i/File/suvisenuxaxivomugifexit.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/42859384707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tank+trouble+2+fun+unblockedPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 10624 bytes
SHA-256: 78465218bc49bfb9c3cedf20e3756f8f1c28417b9dd0ca74d36bd6490a221670
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 19176 bytes
SHA-256: d8162ef8dc5986c0d12476a4e0b82ca387fa197efedcd43355fc26f6493cf888