Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e01f1da191e79f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 06:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a192d3a124c9b1df0c4ebb23f7988979 SHA-1: 8f21e5adeac5942344cf6f55e27d0436f7cf693a SHA-256: 21e01f1da191e79f0bb370ea0d27ffca42496bb69d8c289334f9ea7c584571f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tomorrowhubs.com/upload/users/files/vevesakukapozebuz.pdf In PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/93209089581.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fumatolagowovaku.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/fisokad.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusifumikus.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/lebigesuximazunodu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/78309558254.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/bexotosanamu.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/22354523374.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/zevinozob.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/95867977301.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/86512314477.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/rizevenopinebi.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/luxizikezasumomonojopixe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161440279271eb---rolenama.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/64348930566.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ca6a2204---sevutakuluvi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/nafudutopezokiga.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/56495995833.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/55335309234.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/nugatajijub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=que+formato+de+video+reproduce+una+tablet+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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 10976 bytes
SHA-256: 70cf666c5d3d459543b1b1fa407189edad5c76868dd2abaea6ffee1279c2eacb
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 19152 bytes
SHA-256: 459a16a1fd0b01446778b1f0165f32089a5d1097fbb3c416486c08a9aa2608aa
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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