Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c023b5b126276c1…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 10:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ffd2f3aff88ec9657f84de6b4c55bb7f SHA-1: 68c0862a834f9cedf25c7ca5e7ce0a33baee17a2 SHA-256: 3c023b5b126276c1e0c722f34ccfcb14f9751dddd0e7bf8d7c308dc612d64574
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing, that attempts to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cybernet-ap.com/UserFiles/File/sapozoboxatirizufav.pdf In PDF document text
    • http://riversedgefm.com/files/file/90910022514.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/muwelexawagined.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/85238175157.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/tapomixeneduluru.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/68231376234.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/fimimemodowadedun.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00c93e46dfc0b1b69f2faff263c1f1d6/86822046377.pdfIn PDF document text
    • http://e-sheremet.com/img/wironidixiziwoveb.pdfIn PDF document text
    • http://hmed.vn/upload/files/38186317879.pdfIn PDF document text
    • https://fasleh.net/Files/files/89842751115.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/7614900648.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/defojufijik.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1b841fdf---31350115356.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/96355824607.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/46640891648.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/99901731114.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/92355671146.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/kizonad.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/debolusej.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/72697273173.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/jitusefi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/buvopojiwuwebobepagen.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/28138216412.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/14354711647.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/95492240150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=5th+grade+writing+prompts+pdfPDF 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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 18512 bytes
SHA-256: 1c015cfd02e074422936a6c1d842f2044b1459448afa9f90d1716d67d0a0a816
font_01_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 11024 bytes
SHA-256: 16ef4b16f881026316e9cde63f8f0e411c2246332a2594afd38a6fcef6a4ced9
font_02_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1