Malicious PDF — malware analysis report

Static analysis result for SHA-256 c908392664aab23c…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 14:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5698ec97f622fedef4c659cd0414dca6 SHA-1: cd7d57c0fa1df4822c5bc961566ed77ce203838f SHA-256: c908392664aab23cf8aa9ef480865ba8c301584946e651df8736b725d6f57859
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a likely attempt to lure users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://uniradioweb.info/userfiles/file/jofafuzuwudoturobij.pdf In PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/laxufijiradigorajumeru.pdfIn PDF document text
    • http://atomleasing.ru/media/File/pipujebunonujiwu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2b892aee---20563814025.pdfIn PDF document text
    • https://ntc-container.com/upload/files/32143257158.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/nazikurovedukux.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/40423912642.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/19885073615.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/59343637879.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mejoteradetoti.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27510179953.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/66752201067.pdfIn PDF document text
    • https://ekransamara.ru/files/91807489363.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/757c25371f4c63adf26e29a45a34b3cf/86153600778.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/38897332510.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/21825863978.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zisubidugimobafe.pdfIn PDF document text
    • https://esvigo.com/upload/files/22034653384.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/47222053870.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/xuwesijuruzu.pdfIn PDF document text
    • http://stonebreaker.at/tigapimilirudewemikezexi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/52410707902.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/42396771423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+road+taken+by+robert+frostPDF 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_off0000b008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB008 16628 bytes
SHA-256: 73c374cc893aff54b05a4806b5cf349c515de2bf0c8793f4b0c4609d7d03dc4e
font_01_sfnt_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 10624 bytes
SHA-256: 041426fedecdcb88392d000cbdc2ec757283d0574b7bacf92d58f9d566125b8b
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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