Malicious PDF — malware analysis report

Static analysis result for SHA-256 279d474eeef18a51…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 16:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdcabddd0dce7f897df3bb7e0f196740 SHA-1: 1186cb4f7015c55d5cddcd103ce863882aea9bd0 SHA-256: 279d474eeef18a513222d7f761e783fc5add4a0962a01fd096cfe18782434cc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studioassociatoemc.com/userfiles/files/73178092879.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134892f1ecbd---pigujezi.pdfIn PDF document text
    • http://evola.it/userfiles/files/9643789021.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/moresiregiguxo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/suderavapugepi.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/23978642836.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/72532721176.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/22188884404.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/87593332039.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109031410015478.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/refilefazixigawajapiga.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/72540645423.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/givadukekusegixenuvo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rikalelilive.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • http://mcutech.net/files/22348677673.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613593db92978---bugajobejegij.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/dudibubireguxegatakemag.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/86419814974.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/16554655553.pdfIn PDF document text
    • http://micruts.org/userfiles/file/68404702319.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ropojo.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/49277790614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=install+hacked+games+androidPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10860 bytes
SHA-256: 63a1d608e9d2bcbc4d08711dce21c83932b3d26fbb8f3920f7e090bf73a8bd1f
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 18448 bytes
SHA-256: 11a706cb23deddfa4a67e3c4c5ee2d7a9697e4ee9676275ff54199d18f74bdb4