Malicious PDF — malware analysis report

Static analysis result for SHA-256 736989834a3190d4…

MALICIOUS

PDF

81.2 KB Created: 2021-10-05 17:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2701fe8b89548371e153a6f5c7976a7 SHA-1: 85b3d19cbf294e54c29d118b338253f334e665ca SHA-256: 736989834a3190d47bebf0b5f20b4f214cf9356689f9af7ee9db51db257d073a
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 and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=types+of+soil+worksheets+for+4th+grade PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/98708959240.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/vidugerenuxusapiz.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091623482973499.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/bekarolabofoti.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/51803974847.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wavoxadunetijono.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210921031535574301n5nrdm.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/kegiwibixuzemofop.pdfIn PDF document text
    • https://advik.net/userfiles/file/boxodipafabotasese.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/56754916194.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/42049853283.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/kisopunowon.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i2o6k0q7ljljnn917fpbrjv2k2/sufewin.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/negemogabijarog.pdfIn PDF document text
    • http://sinoorchids.com/image/file/92829996562.pdfIn PDF document text
    • http://8njl.com/userfiles/files/18740328221.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75049471521.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/73612586602.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/natazuxopinemo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/masowigabakibonuzige.pdfIn PDF document text
    • https://ksboutlet.com/file/files/bizikifakemu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/90228298342.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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 11008 bytes
SHA-256: b91f609bd0096f05f67a07e841dd51a9895b687e7ef6be2a8963eeb1d4abb149
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 18288 bytes
SHA-256: 0cabb0749748b1ba2210a90a7a4229c313e3979fcf09bf8d35b646276168ba0c
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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