Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeb8ebb13e5f1e4…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 09:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b671d90523b5ab1f598fada1c65ebed1 SHA-1: d1a7502696866bdaff62173915a4ca410e430549 SHA-256: ffeb8ebb13e5f1e4d19d056cd5e69cff6b515dd9ee61f679efb22e147d74a4bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rowadhr.com/app/webroot/upload/files/rewamewumusumonusukuburoz.pdf In PDF document text
    • http://avemkz.internet-match.com/upload/files/libotiwuvezevax.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/26310239400.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/24851169798.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pubaxopodesadaxamoloxaru.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/29903290205.pdfIn PDF document text
    • https://5udua.com/contents/files/borogibixin.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xopubibolow.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kamewujo.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/2705240901.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/62737528173.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7b95c7a482f4738123238e43801448e/buwijazakuf.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/81065226648.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67416632567.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/57567133386.pdfIn PDF document text
    • https://sino-islam.com/upload/file/240352118584.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/47806844351.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/xigiruwonoribavunuroja.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/biwaviwederoj.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/fakipevajavisokupapilisex.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/rufubipisizi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/51774700447.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/94416471112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=words+their+way+derivational+relations+pdfPDF 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_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 14612 bytes
SHA-256: a38b9ca3f0e6a553bae114e607dbded1b03ee14b39e30ae8b4abed70fab101bd
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10852 bytes
SHA-256: e007912594f0c5d451129269222a10e549690411f3c485d13e559989da3b0971
font_02_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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