Malicious PDF — malware analysis report

Static analysis result for SHA-256 56010049ec529dab…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 14:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b740f7215683ffffeb8273ef6f779741 SHA-1: fc5ad97dc3e535f195edcac200d76467482c4fa2 SHA-256: 56010049ec529dab433f3ef1f64e45896472a80b7ef0e547145614fed6f55ff9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are unknown and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdf In PDF document text
    • http://wixoon.hu/upload/file/83112214262.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pozemusatevuzolabat.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10324223697.pdfIn PDF document text
    • http://koddous.com/userfiles/file/55994469963.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/72416924274.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/fojatodabusewovavis.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/56795263298.pdfIn PDF document text
    • https://bauarch.bg/files/41065175321.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/sofavakamemamutibilig.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vaporu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fikuzumelobunik.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/72908355064.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/nofavudoxuzelirosapebe.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/morurojatim.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/13810152748.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/gorepapi.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/33724790394.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/xoganizuwisivakeju.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bowutoget.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7b4e3fd4---41773609267.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/sulajosuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+check+phone+temperaturePDF 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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10736 bytes
SHA-256: 800dda2c0c4ca1fdf0d8e12e3e678213f2e95bc020cb8bcc777072a1a4d12f49
font_02_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 16596 bytes
SHA-256: 48939f982c9675e5403a9851b3f79ded3b77d0579b4b81ed4cca39eadb696387

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