Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1e701bb510be8d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 15:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03b2b2bda3e65a263d6e2c10253f1b3f SHA-1: 9d1672fdd8fcb0b85ce8e0336b8df94b7d6b520d SHA-256: 9c1e701bb510be8d3303d0315cadeb7df0439995ed37225c2a8767d259ce9973
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://immopolignano.lu/images/kajuloti.pdf
    • http://bjqyms.com/filespath/files/20210924084540.pdf
    • https://theshamrockpublecco.it/file/84666147367.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/35040220227.pdf
    • https://posetili.ru/userfiles/file/pekejotomosi.pdf
    • http://eiak.org/upload/editor/files/zinuwepulidemaj.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/1434588440.pdf
    • http://cl-pub.com/files/files/17434240452.pdf
    • http://location-appartement-venise.com/italie_documents/files/kemupavomarugelezirip.pdf
    • https://shinko-tw.com/UserFiles/file/64921144415.pdf
    • http://thietbibepnhahang.net/media/files/29983735396.pdf
    • https://www.vconsole.com/ckfinder/files/45772058647.pdf
    • https://mercerapparelss.com/userfiles/files/wezawalomututegiwopu.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161446e378f28f---61439740965.pdf
    • http://bolt.fo/public_html/userfiles/files/tuvolirubononujokibuni.pdf
    • https://sangolongphuong.vn/longphuong/news/files/76491182219.pdf
    • http://benly-carson.com/product/files/benuzebifabepewifazade.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/9069671058.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/gamazotagipawo.pdf
    • http://szm.hu/userfiles/file/xugudizopama.pdf
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/95068448967.pdf
    • http://habitat3.eu/userfiles/files/dupowumugo.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/zimenujukodinizijiz.pdf
    • https://pinyardim.com/calisma2/files/uploads/15809215745.pdf
    • http://ankurgroups.com/userfiles/file/60492472319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+tale+of+love+full+movie+online
    • 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_off0000b5d0.bin
4a4570e3ac75a39b96519007d72aad22f653a31a464258f429abe49866db6492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 17480 bytes
font_01_sfnt_off0000e261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
font_02_sfnt_off0000fa78.bin
3681abeec28b2183e0982266dd4e98ae932169f668d1f5a655d979868938cc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10256 bytes

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