Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9b987e0dd7990b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 14:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e4c5b33ed219b27dea806811622b89a SHA-1: 5e95712eab1e64d96d1d08b8fbbe1076223a3b1e SHA-256: 9b9b987e0dd7990ba94600d9e61a1170067f4958a4b59a51f52d9866e26b72a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

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 http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/tovutefeminesed.pdf In PDF document text
    • https://pernambucoimortal.com/imagens/files/66187923464.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/8506275077.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/veluzeg.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/82e3953a393f784c086bb438fb653da2/42669604779.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vazabiwumiwajexapabuno.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/29513161428.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/suwetigovunidazorukesowew.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dalaxoxa.pdfIn PDF document text
    • https://electroagro.es/pub/files/42479562321.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/giwuzibapizunilawotip.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ece5c593d---89564078271.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/10161526314.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/tixewelavevila.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kavob.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wopodesameguzagines.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/68107053916.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/58981127123.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/89696787358.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/18934513715.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/85632529895.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/4244286772.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/pikigubukezeluduvus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bachelor+australia+season+5+watch+onlinePDF 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 19128 bytes
SHA-256: ab4910848db88719af3633008624ff276540e7e92408465c59bdb587b253e84b
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10700 bytes
SHA-256: 709344959badf6776205504aa9fab853f5062f9a97c2b83cdfbabc66b32ce3cf
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1