Malicious PDF — malware analysis report

Static analysis result for SHA-256 384f9b16eb552526…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 04:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187ff565f2a04554597596887a2fb1af SHA-1: b1fbe914a751ed1b622def866d1eb62b84a56341 SHA-256: 384f9b16eb552526883d636b3310d54eeebe24e67e71ff20eb2fde8667deffe8
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Segundo paso worksheet answers chapter 1'. The embedded URLs, such as https://vilenefex.ru/wix?keyword=segundo+paso+worksheet+answers+chapter+1, likely serve as the initial point of contact for delivering a secondary payload or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wix?keyword=segundo+paso+worksheet+answers+chapter+1
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600c70e537d9d.pdf
    • http://yandex-dostav.ru/best_picture_settings_for_samsung_qled_tv_series_6zy013.pdf
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5ffcfe248ba5c.pdf
    • http://mercelus.xyz/tascam_portastudio_424_manualdsiob.pdf
    • http://regvoolkim.website/defidovadovutgagga.pdf
    • https://lorobewan.weebly.com/uploads/1/3/1/8/131871486/tukofeza.pdf
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/mewez_retegaguvewekar.pdf
    • http://devlp.design/stalker_2_police_radar_gun_manualnybqy.pdf
    • https://cdn-cms.f-static.net/uploads/4475854/normal_6038d0302075e.pdf
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/0d6fcb50fd.pdf
    • http://kumokopilomeme.22web.org/how_to_be_a_great_medical_assistant.pdf
    • http://italywow.pro/zozufetezitoq2j.pdf
    • https://cdn-cms.f-static.net/uploads/4387701/normal_60285f1685efb.pdf
    • http://moneyindia.site/the_amulet_of_samarkand_movieey217.pdf
    • http://compte-cmbretagne.best/software_update_android_7._04p5v2.pdf
    • http://extrameets.fun/the_boy_is_mine_lyricsj4my3.pdf
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5fcacaf1e191c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_b8a998be9e6b4f98ab6b0e44088e3a40.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_128493d90fc649ec9ff4dc5cf8a4f3d6.pdf?index=true
    • http://todewil.epizy.com/ejercicios_de_comprension_lectora_segundo_grado_primaria.pdf
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_27277c234ef04e38b51451f276100d2f.pdf?index=true
    • http://rofiratak.rf.gd/keloletuzakomasadat.pdf
    • http://togipumenotu.epizy.com/dijufoba.pdf
    • http://ximeneza.epizy.com/historia_universal_jose_rodriguez_arvizu.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_31d30fed4bd04373ac395634977a017d.pdf?index=true
    • 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_off0000f48a.bin
44d95d69cc25a1880656b3fbdde39a57270c41f192affcb531089d91dfc84b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 5612 bytes
font_01_sfnt_off000107b8.bin
e37171f19768bf3c8b61457745f297ac7305de21833a7d163a1d9eeec7918440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11612 bytes

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