Malicious PDF — malware analysis report

Static analysis result for SHA-256 6132740fbec8a799…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12a9ce214dce127d9308d61befd1bf56 SHA-1: 7430e42d0a8ab84048fd1598675de2ebe8240b37 SHA-256: 6132740fbec8a7994e559b8119cb506808ddf02d44bd68dbf557bc571bf96b91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mpti.ru/userfiles/file/98997304398.pdf In PDF document text
    • http://hladonural.ru/upload_picture/75724967211.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sotunasewadifozuk.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wubulitedividiwidewe.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vinobafezomare.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/wibigomimomip.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140338552c5e---26740675337.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/14779257920.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/vodexefis.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/bixigiminaleso.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b7a2b6aa1c900aa3f8c2415ca3402488/71352505665.pdfIn PDF document text
    • http://samtekelektrik.com/files/96466119355.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/49433873009.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/30582255732.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/janisilete.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/36384544065.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/zuvotifup.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/11122752332.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/pomawimuduzitojefa.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/risapuloratodukasis.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/94709105344.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80414924999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sony+ten+1+live+tv+app+downloadPDF 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_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 10512 bytes
SHA-256: f07231ea3366e74c56ab399ffaf4aafdadea65f403d3415bdc481f485f2ea8fe
font_02_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 17040 bytes
SHA-256: 2801dd943c8eb7b61a1196e87732381b47df88d3a30db9a0f9669227ae5aff7f

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