Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aae75d9e8258723…

MALICIOUS

PDF

83.4 KB Created: 2021-10-09 07:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30e4c59838dd9601259343e545ee70c6 SHA-1: 662dc8e932ba17f6dab1c31b86fb59bf04de35a7 SHA-256: 1aae75d9e8258723578158b59c035a25199e1a12b41f50f50574a88225082e85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a large number of external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiopol.com/userfiles/files/829616241.pdf
    • https://unchiulmihai.ro/files/fckeditor/file/5791101507.pdf
    • http://vita24h.com/uploads/userfiles/file/lerutezaxomuwugunefikuwi.pdf
    • http://rwdwebwebdesign.com/img-aim/files/66777933230.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/roganewonarow.pdf
    • https://www.karelo.com/uploads/File/94599440124.pdf
    • http://giasuminhtam.com/Images_upload/files/sateligenev.pdf
    • http://dellalontra.it/userfiles/files/2971639905.pdf
    • http://chinawin-consult.com/userfiles/navona.pdf
    • http://coaching-scolaire.net/userfiles/file/jugisasig.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f917d7d238e58b0b814ddab8f82517fb/vegomesowaledosilotin.pdf
    • https://jamurgoreng.net/contents/files/xulipomumujip.pdf
    • https://flexi-cms.com/uploads/file/81813332509.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e3848e7ff2---19652645770.pdf
    • http://idealthailand.com/file_media/file_image/file/29516469763.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/74342856820.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/falufuj.pdf
    • https://mumegram.com/userfiles/file/41016798309.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/xaxazutefigajuj.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/5721646085.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafupogotarixiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=riposte+in+a+sentence
    • 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_off0000d650.bin
e36586b47b9ef66d6669fc27d1f3a3a47bbe0b876abab5d8a3e5eb889c181b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 10268 bytes
font_01_sfnt_off0000ed93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
font_02_sfnt_off000105a5.bin
f345a578e490082828829f57202f8a46ccad0cd941e814ef49b9bed7fd760e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 22640 bytes

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