Malicious PDF — malware analysis report

Static analysis result for SHA-256 c058b322bcde5cdf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 03:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaebbafba4e265940657fb057c8cd433 SHA-1: 2fe72c09ea854379f8b5ca2b025a790431ba0a3f SHA-256: c058b322bcde5cdf81589d677ead7165bce571fcc35d1500f58f5bcaed2a3e05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URLs, indicating a phishing or redirection attempt. The PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=143+prime+or+composite PDF link annotation
    • http://sintjorisparochie.nl/userfiles/file/nawexajixinasif.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/94108448656.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/pimemabudigexe.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/67336849285.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109092100485855.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/werasogimaduletiso.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/60262833803.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/58494158732.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/mubugowapatije.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/dd4d00f73c6ad6d7426cb27125897300/sugono.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/suveropabipuwarokinere.pdfIn PDF document text
    • http://travellerisland.com/files/55053045464.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/79758242179.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/99632723979.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/93998699407.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/41969089011.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/wugezexevukesil.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/82110275318.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tudaxobaviremetitud.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/tusewav.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/regera.pdfIn PDF document text
    • https://etadelloro.it/images/file/6152137844.pdfIn PDF document text
    • http://grabnerestriche.at/6261676416.pdfIn PDF document text
    • 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_off0000af35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 16368 bytes
SHA-256: 46d890bd897ff73b5d5d1205f0346ae100c274e07566a26e156fe7f378f8a6c2
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10428 bytes
SHA-256: 09adbce755ba003e947668f9cc0c4c9607562c30a7e63546722f95323aa3ac6d

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