Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0659a93e2631040…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 22:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 417b84e7f98029bffd2f862f433b77d9 SHA-1: 6d1122635dac3499c1b635fefef9f07760687a92 SHA-256: b0659a93e2631040f41606351d3893ece1188476cf01687209c9f6ca1de404e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, suggesting a phishing or scam campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is designed to host many external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=inner+core+minecraft+pe PDF link annotation
    • http://kredoteka.ru/uploads/file/82580285483.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fiwuwumoputotevonuwanuwi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd31c6b4cf---85949076743.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tjuqn615f9bt4hpq2tp8esnlau/vukilivalud.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/xezeka.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/39685566188.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/makegiridunaf.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/kawezijowinoji.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/57088613282.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/vipupututamasa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/subosabubukid.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/57420404004.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kawagusuxijitubalibatag.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/25361006612.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/95554843234.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/dupixigip.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/buzedeliz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/2159066708.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/wulenifoxakewoza.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lixisewisakaz.pdfIn PDF document text
    • http://twilaw.com/files/files/mugasemurolenonabavuxifig.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/10639761182.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/kujodenujitaxubi.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/tovowagojaxovizojizugu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/vofojuvotimimezenede.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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 19148 bytes
SHA-256: f706a62930c03af2007ba317cc05a048b8de1bbee0538905bc5a2a43c43a8ab5
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10380 bytes
SHA-256: 0acaa3d9537fa2dbb0e042c1667a5dff4fdbb1c20f00eb48024d798a12b1bcd9

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