Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbe94d93305a8f9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 23:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5d2f0e8dc967d4526d59d3cb243ce7c SHA-1: f7c946831927fa4679fcd0d675d872e7660ea6d4 SHA-256: adbe94d93305a8f98e312bd325a11935b3828958e7a10ad32dd5f5269f5f4e8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wskinbody.com/data/boardData/files/27335974424.pdf
    • https://yenhuy.vn/upload/files/lasodoridazinakemobupod.pdf
    • http://gat-asset.com/CKEdit/upload/files/33597417448.pdf
    • https://hoongnau.com/upload/files/41213173824.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3d66a4fc---54614826234.pdf
    • http://www.wiz-fac.com/uploadImg/file/27968267524.pdf
    • https://trinityautorepairs.com/uploads/files/8376512579.pdf
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/25031209986.pdf
    • http://brbud.pl/userfiles/file/14650481519.pdf
    • https://amigo-shop.105h.net/upload/files/fomozapebidedemowiloje.pdf
    • http://chuanghuilaw.com/filespath/files/20210901060753.pdf
    • http://newgrids.com/userfiles/file/lelolojisolaxu.pdf
    • https://renhedc.com/uploads/files/202109111728333549.pdf
    • http://short-story.ru/upload/file/8706216428.pdf
    • https://agmatbaa.com/upload/files/42748779592.pdf
    • https://akilanews.com/ckfinder/userfiles/files/tovezufajimafisatoret.pdf
    • https://tennis-samara.ru/img/file/25138979980.pdf
    • http://dragoniresorts.com/userfiles/62082596792.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/xegisebegegobi.pdf
    • http://sk-massimo.com/js/upload/files/salabute.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/17314595963.pdf
    • http://noithatsah.com/webroot/img/files/kerokapavotesubenapa.pdf
    • http://portamarioarchitetto.eu/userfiles/files/kitemizogimosad.pdf
    • http://jszl-rolls.com/filespath/files/20210901191329.pdf
    • http://ominocoibaffi.it/userfiles/files/siwimefase.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=easy+today+robux
    • 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_off0000bf16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 16792 bytes
font_01_sfnt_off0000d728.bin
7ac8c9c0dcc96d2abaf68c3ba52622fa27c3cc904428e0750d9b097769c10bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 16560 bytes
font_02_sfnt_off000101cd.bin
93e39113b82dbdbb9a1c5ef1f2f06d37f6c434f0fbd79f876f13112049335dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10304 bytes

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