Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e01185bcb3b28e5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 11:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb0588ab6dccda252d3b69f0442865cb SHA-1: 18348c5b26640e1bd49219f469ddf197a13363ae SHA-256: 3e01185bcb3b28e56d9d7a0ff6b55be68249dc490d875803591646cd08ee4e2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://didacostruzioni.it/userfiles/file/62761927230.pdf In PDF document text
    • http://stmrcstvm.com/userfiles/file/latewaxog.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/74284795040.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/75299255126.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/sibubaripumedutoraseletu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/39993819788.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/juzuvasibirumumigolu.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/98739886094.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/73494453298.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/41005292887.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/34739411556.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_035321.pdfIn PDF document text
    • http://stefani.cz/fck/file/19596087556.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nonudagananidawifepo.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/dokidapajejavik.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/detugaruxikigira.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/58271960411.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/gowurixu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/1502062643.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kudamefemelabamagero.pdfIn PDF document text
    • https://ahha.az/userfiles/file/remilojutaxixik.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gekofetexerabuliseruzabu.pdfIn PDF document text
    • http://selidbe-beograd.info/files/xilewuwefobobaj.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0351e4dd0cf74af070283cce4ee198c8/raxarazewitujeg.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fonabubamekinamutapopusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+hero+academia+two+heroes+watch+onlinePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/95921388245.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_off0000b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 16000 bytes
SHA-256: 2b8a887013ce261d91c1302343d9997949e9f51c7e8950350333a53990521afe
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10828 bytes
SHA-256: 93baf9b45486639caf08e3833a2b516bbd0421099aced96ab0c68e62083ad811
font_02_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1