Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f1f9bb153cdd40…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 06:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f30e5080880fab0463b2d2b65bae58a7 SHA-1: 86a6626795a646cb8ef4ca7bae2364b582730c8e SHA-256: 48f1f9bb153cdd405fee4bf7e6064c2bc9623ace3e4a12d71ffbb1ecf3edb92f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many pointing to PDF files on potentially disposable domains, strongly indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support this assessment, flagging the PDF as malicious and likely a phishing trojan. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mlead.net/images/e/file/zirukaraj.pdf In PDF document text
    • http://k-ookuma.com/js/upload/files/gebakabik.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/9868772853.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/31087227412.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/42760273224.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fudawufozatazoxurixeba.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/39480764066.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6fa22e9---51896725479.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/91819001669.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/5099361508.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/labilajatatiresusime.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/8130383362.pdfIn PDF document text
    • https://aashianarealty.com/file/61592110263.pdfIn PDF document text
    • http://metzlerranch.com/userimages/jalipijukulozajaridit.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/51621788291.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/72231954373.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/71043035430.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/medikuzikenanuzef.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/28883995410.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/31951231359.pdfIn PDF document text
    • http://bptramptour.pl/files/file/23487379282.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46050950289.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/takimuxenoj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wajutuvexilad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+offline+games+in+mobilePDF 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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 17528 bytes
SHA-256: 9d143ece0f5763907e340ae0a2547dff7f8267b315d0c38c456c1f857194cac6
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 10648 bytes
SHA-256: 6a8f76973b0fafd7f8b2e1fdf62d979d7e2552aee6c1e06bd0f7b5743bb2d799