Malicious PDF — malware analysis report

Static analysis result for SHA-256 c836821af041ed69…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 12:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a7aacb5d3fd454b20259e71b014ef4c SHA-1: 63845adadb5d1334dd6b9c6c4ff8a95bc516c475 SHA-256: c836821af041ed695d04425fdcf09f3785b0964429ba6f9fcb85c912a295070b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update to view content, a common social engineering tactic. The embedded URL 'https://jacksth.ru/aws?utm_term=poweredge+r710+firmware+upgrade' is likely part of this lure, potentially leading to a payload download or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=poweredge+r710+firmware+upgrade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5ff2f0bcd5bdf.pdfIn PDF document text
    • http://opticsystem.website/gubemixodafagetidagusoxusdrzn2.pdfIn PDF document text
    • http://bigpleasure.ru/311754062297inwy.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/41054510767.pdfIn PDF document text
    • http://sabujunakeves.iblogger.org/solid_waste_management_accomplishment_report.pdfIn PDF document text
    • http://cardioactiveufficiale.site/sermones_adventistas_en_power_point_2020u9olk.pdfIn PDF document text
    • http://fegimikerekela.22web.org/akira_full_movie_free_480p.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/jupiliwopobivogelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5ff15b16ee676.pdfIn PDF document text
    • http://talebakela.iblogger.org/empty_pathfinder_character_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lawubipala.epizy.com/vexital.pdfIn PDF document text
    • http://dijinisefiregot.rf.gd/how_to_set_tax_rate_on_casio_ms-80b.pdfIn PDF document text
    • http://bakofenomuzinu.rf.gd/bindingsource_c_windows_forms.pdfIn PDF document text
    • http://surafupomef.epizy.com/oedipus_rex_quotes_about_justice.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/registration_form_in_html_with_css_w3schools.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 5216 bytes
SHA-256: 91e911a60100756e12702a4220b043bf0356e5ef1aa38179f8368deb738d252b
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10912 bytes
SHA-256: 2b6548e7d4656712c2ab3257a9620ecabe15c273dbde43ef86c59234061520dd
font_02_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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