Malicious PDF — malware analysis report

Static analysis result for SHA-256 43af76023180e1ec…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 01:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6808ef8f5319a1a690de41b8ead29fa3 SHA-1: f1ba6b26efeceb35c6ed3b56601dc44a82c62594 SHA-256: 43af76023180e1ec1405af2b0bcb8f384d2dcd20a6c5687c92ce1608c99c956a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zimmerei-possert.at/50333065884.pdf In PDF document text
    • https://btegypt.com/file/widaradomupisujikunipivu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9ee3c0c1---98241593198.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909151921.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/15825020249.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/guzusawubuf.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190714098469.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/xakifinupuzuw.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/84575726866.pdfIn PDF document text
    • http://stroi-sistema.ru/img/lakitaj.pdfIn PDF document text
    • http://airsoft1.ro/files/file/vuvidivofata.pdfIn PDF document text
    • http://charivne.info/images/file/23700046706.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/voturovogavevefo.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/23941448451.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/49998129171.pdfIn PDF document text
    • https://felicityokolo.com/file/24100662928.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/dusovademakupab.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/75279759208.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/18902214456.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/najukotubifutovutamefaw.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/niwazowoporomibub.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/jizavefefakirupuzin.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/bilobapujelazejubadu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/81112570259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=123movies+the+bachelor+season+25PDF 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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 18136 bytes
SHA-256: e114064b770d06bd2f81fe54eb096b36411bfb31d92510963835e3661575ff99
font_01_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 11084 bytes
SHA-256: 238c06738524e5b579ad4f54945649181d1bed6ad0dbc583033d1feaf25f9060

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