Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f12d9639f3a535a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 00:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 375677f666e805f08c975e946b7c27ab SHA-1: b923fcecf77e96f7caab8c951b5fa2f89e945c7f SHA-256: 7f12d9639f3a535a1b510af2cb3eaa0b1f4c817cbdcc29a4319e00f589d25291
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing and a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/5299250.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=wordpress+admin+login+page+not+loading PDF link annotation
    • http://bumawusuka.mypressonline.com/h2o_mop_x5_manual_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/iiidjhc/cookie_crush_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/PGEagiR/oddbods_tr_run_hd_wallpapers_iphone.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/lasko_42_tower_fan_home_depot.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/rofen.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/5299250.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/2QYDHv3/bongo_bingo_winter_wonderland_newcastle.pdfIn PDF document text
    • http://shishkin-seed.xyz/worm_wildbowkl54g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/dewigugesajonutonuwavug.pdfIn PDF document text
    • http://lukugebov.rf.gd/bringing_them_home_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/66379657974.pdfIn PDF document text
    • http://punonawu.rf.gd/lurijex.pdfIn PDF document text
    • http://ximogubofew.epizy.com/ruzuluwamudokor.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5292 bytes
SHA-256: c349c1e73a6444684a4c2fef14efede2575c322ebaf73c90ec8e70f291873ef9
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 11036 bytes
SHA-256: 8f52d42484e7922f276b14174aaf04da77eb30fb84d2c805252d4c5f9436bbd0

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