Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba126e04f3cd0972…

MALICIOUS

PDF

90.2 KB Created: 2021-09-13 10:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a188a38f2aceab92119ab378300a67b1 SHA-1: ed2087ac13a191e7084246b4782931e54da1a626 SHA-256: ba126e04f3cd097288ba47ba633fbfc93d24de86d8d659e146b82ab6c8262b72
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 part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=harry+potter+and+prisoner+of+azkaban+book+download PDF link annotation
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/68626711452.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27715122145.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48048764537.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/zatituwevared.pdfIn PDF document text
    • https://lapakunited.com/contents/files/ravijadukebuz.pdfIn PDF document text
    • http://indemo.pl/Image/files/menopuzefinasimoji.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xizolobazizifepulofaza.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/62131210907.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jogukabosipadinajokev.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/pezisudazugizig.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e587cfa341893a91c533eab3dea31239/60981219536.pdfIn PDF document text
    • http://apsons.eu/files/file/vuwozom.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109080801518622.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sugagojoxetolamet.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/lokugadidinunaba.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/48713318032.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/woxodowowixuzatokepogi.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/vutakira.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/63389608220.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb41f121d3---mafowuxumukowebunixixun.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/99527940596.pdfIn PDF document text
    • https://medtek.vn/storage/file/bowiwo.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/nefeninewabexorisufu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/pesiwosuxigumip.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/juxudaletov.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_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10976 bytes
SHA-256: ddecc8273bd72ca0f4c16c9c9935080f2843e00694163f306b98262db97790bd
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 19356 bytes
SHA-256: 97f68b792cebbe484dfe5c8405245c13e75818f98aff194feb3d2c51baa0ac8f
font_02_sfnt_off00014309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1