Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b39db8abd23ed43…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 17:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0728be8d009560ee4fab2deeea806ef SHA-1: 57c9fb6ddd6be6a0851b20712410d338138e2ef2 SHA-256: 9b39db8abd23ed43d9a8a522f7663d38de6e2f717a2f5f7570c67dd6d6fd20ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://iacsglobal.iacsinfo.org/content/uploads/files/82027557784.pdf In PDF document text
    • http://krcatikyonetimi.com/userfiles/file/82311416856.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb0c4cfd9---bidunanexenomo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fawewasazef.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/46189565978.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/62058174438.pdfIn PDF document text
    • http://labonscafe.com/userfiles/turozumoximupotenefajevef.pdfIn PDF document text
    • http://nemochem.cn/upload/files/saterezatatotojugonuzufor.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdfIn PDF document text
    • http://belloverde.net/emailer/file/88382793711.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3e0fc7235030edfb2580bb37d8124c9/70038975859.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/37865920067.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/57464595866.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/bozobixuxaxudeluwimu.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/46170759054.pdfIn PDF document text
    • http://jainfarms.com/uploads/zebirexosuwanixidobezud.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/46792140308.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/28359423.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/77300814031.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42953516288.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/kezaroturapalogidenarip.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/875845885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+pdf+library+for+androidPDF 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_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 16452 bytes
SHA-256: f6fb441cbfb08f2277ad778332c68b3dca2f8ec20f7a5beffbd17d541ade4645
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 10456 bytes
SHA-256: 034dfe7f70a52461065645de582f8f1257800a5de99e9b223b48051b833905b5

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