Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b37246b92338c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 08:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2cff05a5bd08de3db33ad1cb7b02530 SHA-1: a608aea8a891a4c29432673c4977e9dfafedfb7c SHA-256: dc5b37246b92338c786cff8ef90b5d8b7964565b2221f07ff06dcb512a24f86a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://papaicountrylodge-longstay.com/user_img/files/mefiwulot.pdf In PDF document text
    • http://jafra-com.at/userfiles/file/55493907207.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/73356809168.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/bikupobob.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/ridikuriwat.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/pekuzomipoxevolurebikited.pdfIn PDF document text
    • http://allergya.news-read.com/upload/files/wosufezonuju.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/57736929883.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae61d7c42---68619396354.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/finusabixodogeferejo.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/70545710619.pdfIn PDF document text
    • https://grnca.org/img/files/files/797174723.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kikusavafujakodazamavo.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/57562771308.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/poranaremop.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/25886489826.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/gagufunanon.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/94061583251.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/38619351242.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57259618153.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8efaf3749e6fb86f3ba35a25bca43735/gufibavi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/24628527609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+camcorder+app+for+androidPDF 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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 10788 bytes
SHA-256: b9284636afc5d30297901caea9b27dceb3faea3e1edbf08e20805422d72bfb95
font_01_sfnt_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 15056 bytes
SHA-256: 143d9d71e3cccf7a207de0895c8fd5fb8ec0ce1d2e3faf9993ece501fddf3f14
font_02_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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