Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f1f78124f90a6b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-01 21:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe7529d7fd8da9ceeae8b6d726de5797 SHA-1: 5370aa97f06fdbd26eda30126c604ee8c3a6d928 SHA-256: 76f1f78124f90a6b9a38cbfe39ca35dda48d900566cea898bca13d7b27a39182
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'black holes worksheet pdf' and the wkhtmltopdf application, suggesting a lure. The primary IOC is the external URI pointing to a suspicious domain, likely intended to host a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=black+holes+worksheet+pdf
    • https://cdn.sqhk.co/rubovadu/hixhfB4/dofikurazolezufoxebas.pdf
    • http://faripofijukevom.mywebcommunity.org/14698728496.pdf
    • https://cdn.sqhk.co/gozigawefo/wIYgfVJ/vinud.pdf
    • http://mujabelor.mywebcommunity.org/what_are_the_two_types_of_report.pdf
    • http://tazizinujumijoj.mywebcommunity.org/gupuvixad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesogopobatobop.epizy.com/24670426977.pdf
    • http://sobogelutox.epizy.com/polo_ralph_lauren_discount_online_store.pdf
    • http://gowamatul.epizy.com/46re_transmission_rebuild_cost.pdf
    • http://jisunopesaluzi.atwebpages.com/why_did_radical_reconstruction_fail.pdf
    • http://totolimosoranap.rf.gd/active_listening_in_business_communication.pdf
    • http://divejekojo.epizy.com/wivutidesepofegap.pdf
    • http://buvajelu.rf.gd/91015935541.pdf
    • http://bufalirafuma.epizy.com/pofisozadevejibubev.pdf
    • http://janutepapuzise.rf.gd/millville_public_schools_salary_guide.pdf
    • http://laniferes.epizy.com/dajukojiguxududesipupi.pdf
    • http://kedisijusa.onlinewebshop.net/pasesurevoxa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44e.bin
95936c4e719fc5d63bf3e953eec504645408373a9cb8e7218326269d2ce55a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5448 bytes
font_01_sfnt_off0000f6e5.bin
90eedcc1ccc4f0cb9345c79f0d2dd51301d5d6836d0e594b0cd8b818ba809a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10476 bytes

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