Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebccd756436f837b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 02:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8c12dd449b723c686ab08d9809f534d1 SHA-1: d170dd9b3c4fabb7cc2f83d553c4d136549459d9 SHA-256: ebccd756436f837b1722bae960875854707d72b2b6286cf360b0e0bbf9d1a510
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document is designed to redirect users to various download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dxqzx.com/ckfinder/userfiles/files/20210908_045815.pdf In PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/53902947619.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/19923862602.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/52085551910.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/liwaziponodepenogovoze.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/85593191797.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/48876418031.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/makuxawag.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/57953764478.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/63920944117.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/61817563434.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e13c5d4e9---71908859469.pdfIn PDF document text
    • https://ocw.tw/uploads/files/91588740694.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/tuwagivinulikopifotageni.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/xuwip.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384b0ed06e3---wufurabepuzevozoraxidew.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/31193097777.pdfIn PDF document text
    • http://cutskytools.com/d/files/zitapikepavorip.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/83662414738.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/wawebupibunugifipelut.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/32406627531.pdfIn PDF document text
    • http://saint-party.com/media/file/46332162557.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109051217548513.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/fojerunevun.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/70665206974.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wafodutefofin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+2+apk+obb+downloadPDF link annotation
    • 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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10372 bytes
SHA-256: af74afc1f2fe7a067688857e328ab269b81128f131c2a60c489da219d9aff77b
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 18128 bytes
SHA-256: 2d61d6bd4b6fdb35a9355cb81f0a2d02b675d68a8a3524ed4e03913fa68eb3c0
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1