Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cd7e45208e5f31…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 05:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f77a3118c46fe4c348b7096612b46edb SHA-1: b9ced5e675b7f6d549ac6da24bac489c08c73f40 SHA-256: 33cd7e45208e5f31d1b3401a60168f08c81816de7793e4b5aa233b40cc15f70d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hmanagement.net/userfiles/file/janut.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/bobusesemikojuzofabuwo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/74358381914.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/30228986185.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/giniwino.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/94015044617.pdfIn PDF document text
    • https://toocapen.com/files/kogabikefigoginev.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wupofexexitimuwalu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/76534956112.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/4194633159.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xutulosozokugudum.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613545e837f39---pivafotodamimudomapolor.pdfIn PDF document text
    • http://poorclarescork.ie/images/golavexulokijekib.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1d5f2ce93178141625dd2d4aaa2f450c/36014262710.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/88841711407.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/65122163517.pdfIn PDF document text
    • http://sushibelovo.ru/files/34472107697.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/galixufudosuk.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zemebisaworujimo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/jiwexoduliz.pdfIn PDF document text
    • http://jucal.es/images/file/34419278153.pdfIn PDF document text
    • http://plncse.hu/php_data/file/maxutizu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/vazumekolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gacha+life+apk+new+versionPDF 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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 17528 bytes
SHA-256: 1d71095b6cfd5cbf8564b51eabf36c30a27db275e1bcb15bdf92d726876a766a
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10764 bytes
SHA-256: cc5ba7cba37ea6284ef0379c4c03f2dcc5b4d3a0ea7b179b77934ff84f4e7c95
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1