Malicious PDF — malware analysis report

Static analysis result for SHA-256 877426e0c8721ab2…

MALICIOUS

PDF

83.8 KB Created: 2021-03-27 16:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b1b851b36f7fef8b88d46e96578efbf SHA-1: dd9a0de28cdcd31b2df022134d3d23014e0c39e1 SHA-256: 877426e0c8721ab2db6dac76d24c422cf833f1cf3d7c362b432d705759dcd955
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to host phishing content or a secondary payload. The document body, though heavily obfuscated, suggests a lure related to educational materials, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=4th+grade+math+challenge+worksheets+pdf
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/6849317.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/3453688.pdf
    • http://bexixibeguben.sportsontheweb.net/jadotoxovipigafijas.pdf
    • http://terakusinuw.mypressonline.com/kusesilune.pdf
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/1877988.pdf
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/komizobodovedexoke.pdf
    • http://melowew.scienceontheweb.net/96245299858.pdf
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/wilagobuzadebokesis.pdf
    • http://jepegupunu.mygamesonline.org/administration_and_supervision_in_education.pdf
    • http://duvotikuvazax.22web.org/xegozudiziguki.pdf
    • http://ninotekega.mygamesonline.org/everything_is_awesome_piano_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruxurosagogaru.epizy.com/sony_clock_radio_icf-c218_manual_espaol.pdf
    • http://kepawomokatuke.myartsonline.com/reduction_formula_integration_by_parts.pdf
    • http://xalimelipuv.rf.gd/59378711899.pdf
    • http://rudozorutes.epizy.com/lower_back_strain_exercises.pdf
    • http://vokutenux.epizy.com/mac_shortcuts_cheat_sheet.pdf
    • http://zezofakarol.myartsonline.com/machine_learning_with_python_oreilly.pdf
    • http://kutuwawelozekot.rf.gd/tissot_prc_200_user_manual.pdf
    • http://mukanebesiva.atwebpages.com/learn_python_the_hard_way_3._6.pdf
    • http://jigabez.epizy.com/latex_template_article_two_column.pdf
    • http://rebobimakefeli.epizy.com/angular_2_admin_dashboard_template_free.pdf
    • http://repeputowuz.epizy.com/logilogimodoborezovunob.pdf
    • http://wesimuju.epizy.com/asynchronous_decade_counter.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_off000105c4.bin
004bc36704cdcc5493d4ec1556e1bf4be9b626cbe90fa6f5bc301d125017dc7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 5716 bytes
font_01_sfnt_off0001192a.bin
87277a449fe5e3366e8d758547ae24140a3adb2b232e1c1b21edf05cc1c171d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 11944 bytes

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