Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb5916f63d29fe5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 16:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: df1a9a5cdbe1a041269141354c1df5f1 SHA-1: 8fb88b5b74db5c0b397987de7ef560f5ed7b9ad2 SHA-256: edb5916f63d29fe566917ec42ec4dee6fb08fea83948fbc8c9fb073fd87b2bc5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://irlanc.ru/uplcv?utm_term=tony+hawk+game+for+android PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6be375db---xafubunizefu.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/19133993042.pdfIn PDF document text
    • http://underbutter.cz/download/foto/64063138314.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/33976808006.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/80674998745.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/dusilujaravejoxugujevafaz.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pivabalapig.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/divakadajutipenipiwinokid.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/81474651481.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/14177220293.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/54014189344.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/bazikofusazeko.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/26708000106.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/88858432739.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/98621551544.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/87784227956.pdfIn PDF document text
    • https://cecprint.com/images/file/64719284714.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dojidumanizovomevar.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/vafusod.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_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 18276 bytes
SHA-256: b6b0e262087860e2c23a4dc34c446cb1f890bf7b4fc1233689cfdb983c2342e8
font_01_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 10744 bytes
SHA-256: d7ec66f4442108465e7939df703decc9734b2d2f0850bc635f2c89eadd928123
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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