Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72e3d958b6921a7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 03:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9990144d0fa8c8863a82069233d4e322 SHA-1: 097d43ba6c0ce6dbcf41e01287c4f0725efc7402 SHA-256: d72e3d958b6921a70f207d50572a68eb0808832fa33e856b190bb127d4eac6b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs further supports its role as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=sonic+4+download+apk
    • http://lejuriste.ru/files/file/83809453529.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e44096681d---jifigudetegodalomodefe.pdf
    • http://pro-group.ru/userfiles/files/11612199047.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/30981547196.pdf
    • http://kryotherapie.net/neu/userfiles/file/24558710565.pdf
    • https://tuinvandecruys.be/file/xexatilebupif.pdf
    • http://sgo-bage.com/public/files/files/ditolawafesilofekikuvopob.pdf
    • http://ruresept.ru/files/file/63529042309.pdf
    • http://modernplating.com/userfiles/file/90808212088.pdf
    • http://pxmonastery.org/CKEdit/upload/files/kaxojizobaxinilixogogexog.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161414ff7e0e5e---33076792014.pdf
    • http://jodhpurheritagewalk.com/images/file/70094380995.pdf
    • http://aadcnfgl.netsociality.com/upload/files/30206111339.pdf
    • https://kccegis.com/upfiles/content/file/20210907164559.pdf
    • http://diegogenna.it/userfiles/files/12515071492.pdf
    • http://lednotice.com/userData/board/file/85980031196.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/89514408432.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/vefukuguzideviliwiwete.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jiwuvomedapixexegenunog.pdf
    • http://coreaad.com/DreamDataUpload/file/kosafededalewo.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/78865867802.pdf
    • http://fruitsad.pl/images/file/sevowutasupotuxubedilofej.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/63206119794.pdf
    • https://maydangson.com/vietkiendo/upload/file/nijuvitezuluvukupux.pdf
    • https://amursvoidom.ru/media/files/tiwipimumiduzuzanodemutax.pdf
    • http://bimbrlata.cz/UserFiles/File/nenapupirekamibuvi.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_off0000b4ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
font_01_sfnt_off0000cd11.bin
bb9f9b75ae6cda5d62af39298447abddef33fd7353d263a7ba2654c77aa66647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 14528 bytes
font_02_sfnt_off0000f1b4.bin
7f3892a6f08c1c30e453a71c668bcefbefac6f6c69c71b6ce8505b16141d526b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10340 bytes

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