Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4beab51fd22f37…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 02:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fed249473ee9d4c57e093604f1b0d6b SHA-1: f7e90c64bbc1b35d3eb7a0332445c06881df76c3 SHA-256: fb4beab51fd22f373ea894bc4d97a737e2d7d0acae0370170e341c475e51703f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=apn+settings+for+vodacom+lte PDF link annotation
    • http://sportservistocik.cz/UserFiles/File/23783849503.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/35697920358.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/48068644521.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/xedatuporosivexomogoj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302a11ca9a5---ziralewaribu.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/forikofawidef.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21965429044.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/kivuv.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/midugajokezivule.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210910102811.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/8800050037.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/tikatipipijitavotijapir.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/repodejewibepeli.pdfIn PDF document text
    • https://subarini.ro/mm/file/51496450587.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/kufed.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/8069807213.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/21837607462.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5c4ad2b11b275dcebf96a2b9c124b1f5/gabexulesik.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/rofusekafifetutakumavosa.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wirerasisuzolo.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/3365986836.pdfIn PDF document text
    • http://strahyi.ru/images/file/13588416736.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/95004850903.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 11008 bytes
SHA-256: 6453920891452e8d718087ea60ce468902cf47726ce73cd5bd0c7f54f143a585
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 18016 bytes
SHA-256: 49a69697ed1dfe18e3701c3641912b55c39c825f5645997fd64497b81bd9019d