Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58023d5427130d7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 19:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e850dd29b0f65aa520ab1da6071a498e SHA-1: 9eb6b076b8492c4a8710f72ebbc45a6e12fd3760 SHA-256: f58023d5427130d786f813159ccf918a95ee44ed7381a4a55bf31b69f9d45886
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://beautyyaurient.com/editor_upload/file/dedunifajifipezejes.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/wexizifimiboxapug.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dakanatekebozujewu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/xegakeloteso.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/711789970.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54184732477.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/25174641875.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/vemopakifoviva.pdfIn PDF document text
    • http://debten.net/UserFiles/File/tofuwutufekasezuj.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/52851692614.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/53780386296.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136581a6a4c1---fulopomurivipazufigos.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/kutaritedezifobefov.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/35859085337.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/saxedofurelegefikolo.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/luvelutujalusipivigupamub.pdfIn PDF document text
    • http://szpk.hu/_user/file/vasonod.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/97469757109.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gozelako.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/mukegon.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/1178460871.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/27533422782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=friday+night+funkin+madness+combat+modPDF 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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 11300 bytes
SHA-256: 730e64f39947b929e64933463b5f9e3de9f5f01182f36420ab75bd143061bcc2
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 18328 bytes
SHA-256: d058e4615aafbfea5b64ad25bdde0d00cd6ac40a216579f24dfa623214f45e70
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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