Malicious PDF — malware analysis report

Static analysis result for SHA-256 3816d1e3fad6c6b6…

MALICIOUS

PDF

94.0 KB Created: 2021-09-22 09:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 172d00b40a84d0bab9b6386f07d9d9f7 SHA-1: 9935d398e447c11785a539c4287a6e8ba3cb2dff SHA-256: 3816d1e3fad6c6b6ca4518cfcce1a7545c8fe7c2927d70589ef1e357d4595f24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with a high heuristic score for embedded JavaScript. The PDF also contains numerous external URIs, many of which are hosted on potentially disposable domains and appear to be link farms, indicating a phishing or malware distribution attempt. The embedded JavaScript is likely responsible for initiating the malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497c35d0722---14753430969.pdf In PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/solixipijifogapokewipudis.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fomopa.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/wawisonibem.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e374bdb5---nexejoxok.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/6169379646.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/siwuzevu.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/wakiwesonitirimarapubud.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/57507849457.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/55976835721.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/59852393812.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60343078903.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc06e32e2---69890846612.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913111618_NzMxMjgwMTMxODI=.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dorukudi.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/21329354598.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/fiwubafinonarikidis.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judejovi.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/nebulurubedofaseporogebuw.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wopimet.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vavanofibafujidamo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bevawunujexamobabaju.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/86747782779.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/lifaxotud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=10+things+i+hate+about+you+full+movie+123moviesPDF 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_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 11352 bytes
SHA-256: 0f0a86d3caafb343e68ce925a0cc9309699f0d13e03d8001883fcded7d63de4f
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 17304 bytes
SHA-256: a0ab4d019a22e3db51a0df6c969d1df4afdac72bafbeeab6fd2f1c35edd0a885
font_02_sfnt_off00015207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1