Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ea8d52d34dde7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 17:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179837a32529422b36c7780a63bd07e1 SHA-1: 0f0aecce403e318de855773eb24a41e1149f1534 SHA-256: a85ea8d52d34dde701275df52107bf4e7132478498fe72d9fff730e45f044401
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495bfaa8201---74361433963.pdf
    • http://muszempilla.com/files/file/tiwupibetebun.pdf
    • http://asirakademi.com/resimler/files/60884966873.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/79289357807.pdf
    • https://chungangroup.com/uploads/files/202109041255362186.pdf
    • http://kenhuffbuilders.com/userfiles/file/21494669867.pdf
    • http://savytrading.com/userfiles/file/3020372036.pdf
    • http://ascensionchina.com/userfiles/file/jomemabozewoniwu.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/liliwevajusuwamili.pdf
    • http://oletrans.sk/editor_uploads/files/dazixukonejagoru.pdf
    • http://dyglas.com/userData/board/file/42159257905.pdf
    • http://vce34.ru/attachments/file/lurapasedaporojuxel.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/57908716813.pdf
    • https://oasis-travel.ro/files/xiwumuxudu.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/38421566649.pdf
    • http://hangquangauto.com/files/57872393865.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/65117230331.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/81226309993.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/6972972753.pdf
    • http://share-world.tw/userfiles/file/xamenolifabigiwibor.pdf
    • https://cgeminfos.ma/upload/file/rakotebigepakeki.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/41292349367.pdf
    • http://accapierre.it/userfiles/files/57718430411.pdf
    • http://choinka4x4.org/cms/files/file/vutufitiviwakizizufevew.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccce42d35---jatujorerag.pdf
    • http://demkapi.com/resimler/files/13946892050.pdf
    • http://deurenhanger.nl/userfiles/file/defijul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vba+excel+2013+tutorial+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_off0000b712.bin
d9b0a993201dcc55722606c88fd27633c16e642ab118aef4e97613b8b0532e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 17304 bytes
font_01_sfnt_off0000e339.bin
896a49a7f3f214e56a37b2536fd1ea266986030d63fe0ec03752ef8a5875158d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 11116 bytes
font_02_sfnt_off0000fd3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16792 bytes

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