Malicious PDF — malware analysis report

Static analysis result for SHA-256 113503f198f2bf61…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 00:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5fe7b93edddfec2b15a72ee973e87c SHA-1: 1d93e3c9338b9014cf7b4aa57fd7f1dcc5daec5e SHA-256: 113503f198f2bf61fd7512e76d8809ce98dcff915faa4a90cc6a4278736c4cd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, likely to obscure the true malicious destination. The ML classifier and ClamAV detection strongly support a malicious verdict, with the embedded JavaScript likely facilitating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=among+us+hack+skins+pc
    • https://betenagro.com/sites/default/files/file/xowukoguveredu.pdf
    • https://asiantms.com/ckfinder/userfiles/files/76264618793.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/16356566088.pdf
    • http://worldnaturalfood.com/image/upload/File/pejofurubimase.pdf
    • http://skazka76.ru/pic/userfile/58157720447.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/16945868174.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/sudakirigerefopu.pdf
    • http://baohanhranghm.com/upload/img/files/14980570285.pdf
    • http://cuacuonbinhduong.com/upload/files/darujonumotabukal.pdf
    • http://agisma.ru/files/pages/files/53244806182.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138664c529e3---43404622886.pdf
    • http://jinruily.com/UploadFile/file/20210910181229623.pdf
    • http://webbuilders.com/files/file/18945512607.pdf
    • http://farmandari-sarvestan.ir/images/news/files/71792283162.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wedimovojoxosasoxej.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/bogosebovafonavawifup.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vepexelanuronenifir.pdf
    • https://ratsimae.ee/media/contents/file/23037572478.pdf
    • http://j1medical.com/uploaded/file/mewodur.pdf
    • https://tradingphrases.net/userfiles/files/jalufenidojimenujodowu.pdf
    • http://varosom.hu/userfiles/files/35304242528.pdf
    • http://rosesrealtyhomes.com/userfiles/files/87489077489.pdf
    • https://kanalprofi.at/UserFiles/file/zirus.pdf
    • http://www.colormotion.cz/UserFiles/file/gajasigupogemowafowivarow.pdf
    • http://alimentosldm.com/userfiles/file/pinobemiworusakewofigosap.pdf
    • https://familienbilstrup.dk/userfiles/file/78859200142.pdf
    • 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_off0000d7a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
font_01_sfnt_off0000efba.bin
674f233fafa9506f85cc55172a9cb727e484dcabe46b4e50acadfdc549d86002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 18440 bytes
font_02_sfnt_off00011e3c.bin
93d0d22af466c1f82d73521fdf19451b5958a5c5a31f759065296d973f6c4c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10616 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.