Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae46668a4f0af95…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 18:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ee92c565c2a9457205072fd4630302a SHA-1: fb63789be51e431e91c76d15ff8b3db3ad3df6d5 SHA-256: 7ae46668a4f0af95024b94b3c0878b361403f712f5d6aac0da71f10e6d4f7c3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used for initial access and potentially further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://occahomesearch.com/userfiles/files/gitopivugupi.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137539b7a4cb---3353718564.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/luzeluwud.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/34350636203.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/mumofojiguto.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/werinagabovisutiza.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/53496885104.pdfIn PDF document text
    • http://bdsductri.com/upload/files/18258850099.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/8370577985.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/nuvevorexuwibuxisopezujo.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/molejugip.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/37474183069.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/tolinuxowes.pdfIn PDF document text
    • http://kodemari.info/data/files/zuvofa.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/xubikebunuvasazosud.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/uvpjg5vtedpcnprd2stsj2fj71/xawuvatoguweveporu.pdfIn PDF document text
    • https://red-adlay.com/upload/files/fizugudujopoxu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/neponadixixufulafamiwugot.pdfIn PDF document text
    • http://livestocktool.com/d/files/41426432209.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/34514502006.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/87894579427.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/23974747435.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xixujoximijuxipepifafewun.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090710474492.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jazetazigurunojuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+ringtone+gujaratiPDF 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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10520 bytes
SHA-256: 3c22e4d2c621dbc458c858e83310271469134719b9e8442e53b856935ac70d49
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 16772 bytes
SHA-256: 173e9f27d56a26a048ffccbaeb65086780dc2572d3abe8228e010436432a61b1