Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6cf5c3580f7553…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 10:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27dc3e78e299a44ae1eae83d763a1304 SHA-1: 2e22edbbebd8eed54d5aea80acec5c0ea63738bf SHA-256: dc6cf5c3580f7553e49f1e4a009a45366384e117587a69d497aa078e445256d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting an attempt to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cochemical.com/upload/files/vojikoteke.pdf In PDF document text
    • http://thuocnam.xyz/images/files/xunofizazaz.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/66484722085.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/xoxovawalasikesaw.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/5758169879.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c270d3fcafd82438bf512455324a485b/wemawexoriwitajejonabi.pdfIn PDF document text
    • http://all-premium.com/user_file/files/26455557650.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/rebuxekuxogorokimidu.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/9013510008.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210919194449_d2lnYW51eG9tdQ==.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/bilokiruzaroduxinawas.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/46549927892.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/wozebumagaranevode.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612f0771cd239---vanolofejikidi.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/fujogaxe.pdfIn PDF document text
    • http://bankkartya.hu/js/ckfinder/userfiles/files/23963222924.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zugawodukibumob.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/95339713732.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tipebuwoletowalufajanuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+kr+version+apk+and+obb+free+downloadPDF 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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 11060 bytes
SHA-256: df5a767c58636bade500585f0fd2f01fbf6e13061778984ca5eda1fca7ad271b
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 17548 bytes
SHA-256: b3553fe431efef7999dc165c8492c2e1e2cad57cba61e3dfc4d8d7684396143e
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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