Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b17791810de0e1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 02:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75e2e944d1769abbd2fb808144041f7d SHA-1: c723ce391a98b4c97107a00cab48fe4ce51bc80d SHA-256: 50b17791810de0e1b5365ecca1b3a25a00780c9e445f9c4fbca25153698c82e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to direct users to potentially malicious or phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://u-spot.biz/js/ckfinder/userfiles/files/dikaxeguvari.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/lisagibutedat.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/84551526879.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/96323320602.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/1754267674.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/12996200307.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/mitipopozinumisubul.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kavatobebanagirev.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/popasa.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fedapimanavami.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5jndo0q0u5pu9begmd8sg93ro5/bupuzovajuxufugisukiw.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/54948663967.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/27220071060.pdfIn PDF document text
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/79348077654.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/gojoleragumevag.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/87278103162.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/jezirusamunaga.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a1182d9f---zulab.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/daxisopikej.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xudisumalivizaleti.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53248628237.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gezexafixaxovekubepulo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/dewotujiziwowarosuzaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=real+flight+simulator+apk+hackPDF 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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 16356 bytes
SHA-256: 0543169386b6a94b2bf8ccb399f2638f6f4009540f78eed5ca3b4408cb8bc4e1
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 11060 bytes
SHA-256: d5f7266f7314f9a429061cc00cf782fdbfc443a1f09acd18bc42c3807e5cff88

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