Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad189340a939a95…

MALICIOUS

PDF

91.5 KB Created: 2021-09-16 12:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a0bdd2f7e077d15d8014add820e4b96 SHA-1: 6b8f48264850d326a1abbe25d6f933e6d0db804c SHA-256: 4ad189340a939a9565da618aef0e590463761ebfd69f41091409f364d9b810fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://juhaszautovill.hu/userfiles/file/29969058449.pdf In PDF document text
    • http://autoscuolemontagna.it/userfiles/files/kibuvizasuvaporitovowi.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630454873.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/pimivon.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/10089747294.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/57222019173.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_121053_803.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/foxokija.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/padawovezipidi.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/wemuxegavajexekifu.pdfIn PDF document text
    • http://vit-physio.de/file/51038441932.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lekofijujupevijukomomuwi.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/29092876379.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24671924068.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47926615099.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/51352350644.pdfIn PDF document text
    • http://geodez.com/pliki/file/16142974649.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/furepafor.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zejaboposuwugor.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/48806186744.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vosukun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=patito+feo+pdfPDF 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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 22088 bytes
SHA-256: 029f0b57b0b75ae69b3b5cc7da26dc56edab9c56df84568a3ca63fcd3fffe045
font_01_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EE 10072 bytes
SHA-256: dc492e19359a70f7c1db49a840ab49e0511c2b0b8b714a777353f3a099d63b02

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