Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9db7f0f05d659…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 23:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ac94b0f7b3eb4f4d7cc623f8905dca6 SHA-1: 53bda652e73b643aa2fda5ed1fe3a69ed4b1729c SHA-256: a5a9db7f0f05d65918fe0a6e3f706fd1bd8dc8d2b1c8ada17c36c9b638b03383
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and numerous links suggest the document is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=distancia+de+cancun+para+chichen+itza PDF link annotation
    • https://landatur.com/files/galeria/files/42717400244.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25424200024.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/befudatubuwerekasalo.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/gupigudatoke.pdfIn PDF document text
    • https://norservis.com/files/files/nopawalivaj.pdfIn PDF document text
    • https://breedlife.com/upload/files/mubuwubowelejiwixilero.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_A2726D22B5166B77.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/7781589665.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xetakoganowafejufi.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/79179670511.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/16766835425.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/kumeka.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/98505222800.pdfIn PDF document text
    • https://ewt.cz/res/file/kavodoporijolosekonul.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210911_E2B265E2B1D18BFF.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce4155a07---9783711609.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/gajawazefupego.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/29266624467.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/79576259325.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_9C7250B9FA4535A7.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xenafewuzalejin.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/pifixegij.pdfIn PDF document text
    • 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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 10608 bytes
SHA-256: 561239551255d5d58e74c1a5ae96185b4027ea8c80e4206e325f324417fc89dc
font_01_sfnt_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 17656 bytes
SHA-256: 37a05885a2d92bf3b57ad6d99c196fc551160d4ae22060d75220e4016109c4a7
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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