Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b88322183d95050…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29a4e2cc80ab2dc5cd22cbd3f183dd25 SHA-1: 8bd48f759e17938115dbf2d2354b3448042bf4a5 SHA-256: 9b88322183d95050a2142daab7ff98ee8fb77ca92cb6fc267df9481aefed083a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=how+to+figure+out+wifi+password+on+android PDF link annotation
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wovarafininipe.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/8820093189.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kuwawubi.pdfIn PDF document text
    • https://icbacademy.com/upload/files/nined.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/vutifizitexumekifos.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/35305181489.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/ketarezadixepodefoto.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/pejomujaroxaleravow.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92664995169.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/tutaguxapogedaviwonegaji.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/55968470268.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/9506057564.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/84977196663.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/keganunekejajufit.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/kubejenogikofivukupaxe.pdfIn PDF document text
    • https://onlinendttraining.net/files/nosixabu.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/puniwofujinav.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8914373586490c6ec24d4b618039f678/40198482481.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/88476556924.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/xezusuxewojawafozixer.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/weretexodegafulesa.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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 10804 bytes
SHA-256: f53a6be5232902c485d8fb3ecce44121ce5c9c24c9baac1f3bd08604eb875206
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16296 bytes
SHA-256: fd3692245d1ac297c4261e122de9f77f2954e0c920cfd2e929210629a6cbc6da