Malicious PDF — malware analysis report

Static analysis result for SHA-256 76de49afbc1f9cf9…

MALICIOUS

PDF

82.3 KB Created: 2021-10-14 05:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eca6811f189e952a2c6f016d7df20aa9 SHA-1: 1d2a61d4865d7e0491385c9d7d53e89e6f738dca SHA-256: 76de49afbc1f9cf9c7c1d0db1c29832f8830c4e52063c1eec2ff3077e6a40bc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript points to potential execution of malicious code within the document, likely to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=phineas+and+ferb+summer+belongs+to+you+watch+online PDF link annotation
    • https://aimtronu.org/userfiles/file/96556600450.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/43579316897.pdfIn PDF document text
    • http://chinalabware.ru/d/files/42692646243.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/3361430094.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/10107751474.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/4834809544.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ginoxom.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98461800823.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/57802524078.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/37956865626.pdfIn PDF document text
    • http://falconltd.pl/cache/file/nubusu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/durefuno.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gexuronetidapipulafegerir.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/69033158525.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/kozidikesawa.pdfIn PDF document text
    • http://happy-land.hu/editor_up/90430002403.pdfIn PDF document text
    • http://zeci.nl/im/image/nutebibejolamomo.pdfIn PDF document text
    • http://www.bash.cl/media/file/lenexotazujosinam.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/lawibekevizowow.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/65694724860.pdfIn PDF document text
    • http://gosapahostel.com/userfiles/file/vilixamuvi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedcd00f8a---16856356415.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/gemerab.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duvokerod.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/94766879257.pdfIn PDF document text
    • 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 20032 bytes
SHA-256: c21a5ec13f4528c92463e8bcb48f470206a7494c13950de3ee6d976514e85e97
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 11364 bytes
SHA-256: e12c87c02e42777c6b34da202fdd908a62af7e789727205e7f1badf4702ec99b

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