Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e9d3b222519881…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c20f2a07f8e813c9b9ad9df5802a4f23 SHA-1: 0977dfe4948503abf6a5e63a2d5d25b536a9de8c SHA-256: 27e9d3b22251988114e6d19edb9d2290c14dcf162df4f14e61848ed277e5b3ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or downloading further payloads. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://bnbtravels.com/ckfinder/userfiles/files/87733165916.pdf In PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/80850508978.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/47438873536.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/belagepozugebatosibigeka.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/jedaveb.pdfIn PDF document text
    • http://veitali.com/upload/files/66444715963.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/degaporune.pdfIn PDF document text
    • http://lg-palette.com/upload/files/wisosovokezuvazekaku.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/miwelegipelobaxode.pdfIn PDF document text
    • http://chinalabware.es/d/files/zusipet.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tasejuvodurosivarev.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/31150330771.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/63393884367.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc86e84e9---50126915253.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/34313915996.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/zixuladegitovudin.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/96085873255.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kurafexasefipuwiveguw.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pemitolukonufunup.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908183615308.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mufate.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/kuwunelelemevikulix.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wowuke.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/47367868579.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/91228387005.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfa7ab683---2371071754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=convert+excel+to+android+app+freePDF 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10644 bytes
SHA-256: 4a892c78fe2e49286a56cc98cbc7bc714d767f2532a149b4185b99d7870a5535
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 17188 bytes
SHA-256: 2f9490667c89bfa6949070df9954e1047665b84338fa972a5bcf5e6c48f96634
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1