Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d962adc0eb8398…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 08:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bf3d2fc483006421faf9dae01e4ec2e SHA-1: 9544dbe0cb26b79ad15cc7705ce6ed839f43dac3 SHA-256: b3d962adc0eb839852fb027f72135ae0109f128ae073024ef6e93c9bffe13683
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a high number of external URIs pointing to disposable domains, characteristic of a link farm designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://grandioso.asia/editor_upload_image/file/duziralumuv.pdf
    • http://arqing.es/ckfinder/userfiles/files/panevoposiloxemixamoron.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/35264767963.pdf
    • http://www.deco-interieure.com/userfiles/file/27390158263.pdf
    • http://kechengchem.com/upload/files/wezosapuvadakepupevar.pdf
    • http://dlzhrjd.com/images/uploadfile/files/25615212981.pdf
    • https://mehreganimaging.ir/images/upload/files/59042949423.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94937413013.pdf
    • https://renault-service.com/userfiles/fumudiginugom.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/91711891593.pdf
    • https://podimercrm.com/img/files/vubaso.pdf
    • https://bednidhitraders.com/userfiles/file/tutemofudomosabitofi.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340f3720dae---zadokixad.pdf
    • http://studioturina.com/userfiles/files/wenadesiki.pdf
    • https://tigapilar.com/upload/files/75717152410.pdf
    • http://kruengrangthai.com/files/files/53916913761.pdf
    • http://tugrabilgisayar.net/resimler/files/74206243939.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/mimujelezukuwanab.pdf
    • https://oalysa.cz/ckfinder/userfiles/files/58027719950.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/35028312011.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/23472376770.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/metobadawogosanovuliroton.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/sosabomitulasunuveboseg.pdf
    • http://spbi.cz/res/file/kigoweruvidefep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=one+piece+stampede+english+dub+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def8.bin
068aef39d22655f7c8e9ee769087d82ab3e24485c48146cd7d9dd459920c07e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 17968 bytes
font_01_sfnt_off00010d76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 16792 bytes
font_02_sfnt_off0001258d.bin
1d51fdc4df3769c3fbb9851355cebdec59f280194f0ea4e3b0816e86f1dfae5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 11212 bytes

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