Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4216e2c33f0a06f…

MALICIOUS

PDF

88.0 KB Created: 2021-03-28 09:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ad6ac7d69e1c88a59cfbefb440da69 SHA-1: 6e0e83a41d25fe24d57ed583666616263cd0406c SHA-256: c4216e2c33f0a06fe9261b51a373fb35d62e0744b56e3b9f4312d29fa6b8f90d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'Viscosity lab worksheet' and the authoring application indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The primary IOC is an external URI pointing to a suspicious domain, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=viscosity+lab+worksheet
    • http://tuworiki.22web.org/busqueda_de_informacion_en_la_redaccion.pdf
    • https://degewobajobazim.weebly.com/uploads/1/3/5/3/135324790/nalemimirijemedin.pdf
    • https://cdn-cms.f-static.net/uploads/4464067/normal_600fae7c423ca.pdf
    • https://lobududovidaxu.weebly.com/uploads/1/3/3/9/133997350/jabulavu.pdf
    • http://tegor.xyz/wogofuxodogevirexazemeqsb.pdf
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/be233dba9.pdf
    • http://exampl1214.com/david_s_bridal_wedding_gown_rentalsgy8b0.pdf
    • https://cdn.sqhk.co/vumuwuxa/bjigUyp/1980_riverside_drive_macon_ga.pdf
    • http://dom-bita.org/what_does_abnormal_findings_meang9ktk.pdf
    • https://cdn-cms.f-static.net/uploads/4421787/normal_602c72cd01498.pdf
    • https://cdn.sqhk.co/lilapanorup/iGghgig/ledaxumogovisivokage.pdf
    • https://cdn.sqhk.co/xedaberetaj/FjdFhcn/no_1_trending_video_on_youtube_worldwide.pdf
    • https://cdn.sqhk.co/sofizagumup/eKjeSic/this_means_war_charles_jenkins_live.pdf
    • http://efarbok.xyz/96340715513ytz6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zonefodewev.rf.gd/kinaxorudojotovonizigar.pdf
    • http://jurigixa.rf.gd/nafuxesomobepubigewa.pdf
    • http://nakapuzukatojog.rf.gd/89319034884.pdf
    • http://moborudazijom.epizy.com/pan_card_online_format.pdf
    • http://josegofubusem.epizy.com/atlas_of_paleocene_planktonic_foraminifera.pdf
    • http://potikuwujez.rf.gd/solving_quadratic_equations_by_graphing_calculator_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c9b.bin
9eb2584f6ebe6ee747472888665d364b8db0a82c57447b05cf3c1b687edac675
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 4932 bytes
font_01_sfnt_off00011d84.bin
30334176eef8f12d0c83e98247d5d44cd4e75f66116bcbcc00fa12b455cf6d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 11444 bytes
font_02_sfnt_off0001448f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 4324 bytes