Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da37e252ea4ccf…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 23:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecf46bd9719487ddee69358fdb45bafb SHA-1: af9ac9526775822064391ae7f4105daa0356004c SHA-256: b8da37e252ea4ccf0fa0a4bd37ce4b4b185b995f9771b12ecb1cd3f757719008
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=extreme+car+driving+simulator+hack+game+download PDF link annotation
    • http://fine-cottage.ru/userfiles/files/69632541845.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194151016307.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/82801319752.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/puligugavosoduramikeso.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tomimixa.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/97939807583.pdfIn PDF document text
    • https://bem-sa.com/img/file/betejidubutuvekomasi.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/21877498764.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/gifijaf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7302b915d---59373024167.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jipadati.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/piwunekutetal.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/vebavoneda.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/72492069683.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/kezanugezovexoniluv.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/14139307260.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/vaduvetamijo.pdfIn PDF document text
    • https://ewt.cz/res/file/22588429518.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vopeg.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibomefolazisuxojejo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/libonideselesilulajovoxi.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/winaxubuwusizelu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/laxovunikanepotofobulujar.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/pusibiwojaviteju.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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 17212 bytes
SHA-256: e1fa8cf88ba392228057c4c69c75ccdcef840ecfba156ed12704fcdaee47abd9
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 11248 bytes
SHA-256: 7b730b2c71a965654cca48ccc2ce2417738171fdb8b045ceb3356b8bce04e0ac

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