Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9a22fece32a6a7…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 06:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5371dfd1bf730908ce5b1b1a18b290e2 SHA-1: bbcd19f9dca7d82214f378dad7ead38c00965ea6 SHA-256: bd9a22fece32a6a77ce2a996692847f3879d7f3edbfd5e1b923a1ad9fcf6cbff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm intended to obscure the true destination or distribute malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://azseal.net/uploads/userfiles/file/75185882609.pdf In PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210919_15BA91E8F3845EE2.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/bedezumudew.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/bilezebi.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/roroxagipifiwesopejurober.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/37517154560.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/17316560128.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16145a3e44b44e---fagixudarikozewudab.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/togelifexi.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nijosibowefefedegamiki.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/11750617756.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xilasadegofafovoradotob.pdfIn PDF document text
    • http://hidropro.hu/upload/gudikabolixuvo.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/tanavebemam.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/46941957897.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/dilatedalowibaza.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/28158787450.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/zexopodavejebesesud.pdfIn PDF document text
    • http://bibikid.ru/upload/zexepudi.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/zigirix.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/79757306095.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/tinitedot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=other+name+of+mosquito+starts+with+nPDF 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_off0000acf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF9 10788 bytes
SHA-256: bc6935a08bac8dd47ba39f505dd63d09cbc5df35d3d376f28834ec10138055ba
font_01_sfnt_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 14772 bytes
SHA-256: 43d1695fa927bce1f89f0f4fef6276999fd302dcd2c656f33daa4529217e9a05

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