Malicious PDF — malware analysis report

Static analysis result for SHA-256 272c48bbc29c6811…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 00:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bc621ce3f245f9a7dedeb5cf3cbd17c SHA-1: 95585eb53313413068840a50254c7698be277176 SHA-256: 272c48bbc29c6811356196b3ad8a0f196e53d01832b608489de24c6679ce574a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uptownherndon.com/uploads/files/51192706462.pdf In PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/nojiwu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tegoxixolizunexelul.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/nisiripuxarupotu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tinenomuwufefove.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kasujupitodajagufi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/botalem.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/52530306944.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/febopat.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/16971052375.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/47077143632.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/tojegikafirinenonojumenon.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/96090553808.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/devepivawaxif.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tadexiwakijun.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pabofadesenokirapozus.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613772bd62f2b---gavuzuwitixodilor.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161385e0566c72---90230575682.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/debesosolegukirerozo.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/wiselowubisudab.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/maxugixudepibibu.pdfIn PDF document text
    • http://xenangheli.vn/public/files/23813934924.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/kafolavademoxijefabonasof.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/sevigesakalevunumaxarasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=snakes+and+ladders+3d+mod+apkPDF 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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 10700 bytes
SHA-256: 9e69a73615cf56f42d6dd23ba5a653acadb0722c93bc4fd31564605dd7f39b8e
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16932 bytes
SHA-256: 3e544d6b7e0c617333ae0515baa69ace74d09e4ea91b80d5e7e01bd534cee285
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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