Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ea82153d2c0dcd…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3fd0948a9b901a18d7e1c25598c149d SHA-1: b51832b18c3d8a1fa4b6a5f6fc854ff437fc752b SHA-256: 83ea82153d2c0dcd1c47d7e3306caa6dc938340f108884111093a55d90ec3891
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute malicious code or redirect the user to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://edallyshop.com/upload/files/46344034404.pdf In PDF document text
    • http://haithuanphat.com/uploads/files/mijumopizon.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/nijunimamawojow.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/83064253326.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/giwimak.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/79841389275.pdfIn PDF document text
    • https://esz.jp/img/editor/files/95482707122.pdfIn PDF document text
    • http://katela.net/userData/board/file/rogiwavusugegemu.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/65529266733.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb788b266---642151018.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/92690614881.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/newiwasusej.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/gatabaxikokasatedanafe.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/66044529652.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/wupugifovure.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/97596399962.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mapimaga.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109130141491143.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/941687644.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef310dfc98---mumaxiwaleferakuwelot.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/76684160295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=jimmy+bondoc+grow+old+with+youPDF 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_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 10788 bytes
SHA-256: 210c46e133d3ee33732f9ffc996021a7c259b1cd143759c97cd320631ee777a1
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 17676 bytes
SHA-256: 2395a769354ea6a3ccad0f70bf347a12d3d827ed112305c65cba0086ba042880
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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