Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd825802012ee4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-02 12:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0546c9e4ddff803fc697e98508b8e7db SHA-1: 736d79eee5068f600654b6e4c525a2a8c2f2af98 SHA-256: 21fd825802012ee4035fcd9ff620ab0df7bbf9b83afb2b176c2c6fb44116938e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, one of which is directly linked to a lure about 'thermal energy worksheet middle school', suggesting a social engineering attempt to redirect the user to a malicious site. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this attack pattern.

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://vilenefex.ru/wix?keyword=thermal+energy+worksheet+middle+school
    • http://shimano-stradic.ru/xulejuzijovupuzelekufigunw4lc8.pdf
    • http://leree6.club/22100960294jp1n2.pdf
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/xibaxaz.pdf
    • https://cdn.sqhk.co/sisamide/h5uzjcx/image_editor_app_iphone.pdf
    • http://obschee.xyz/xopofazedalukekonujuwilifease6.pdf
    • http://ouily.xyz/dungeoneering_guide_puzzleszcc4i.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_6016d2e7244e6.pdf
    • http://natalifu.22web.org/charmsukh_behrupiya_episode.pdf
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6032159486a6d.pdf
    • http://salestore.pro/gildan_activewear_srl_rn_93846_ca_25181bzoxr.pdf
    • http://terem.space/nuvufijefisudarexupoboraty5mzl.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_603e17dbac364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zefojebenodimu.rf.gd/47399695443.pdf
    • http://xinofiri.epizy.com/hse_site_inspection_report_template.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_off0000e389.bin
bfefeec1c3df75bb70085612182532fb0ece9b5ce0b2632459a924b70bcfa5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5348 bytes
font_01_sfnt_off0000f59e.bin
e9dfb8addf14b4dfca59d4e8d55244b7bfbca28f16127ced00883e925cbfb17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10408 bytes
font_02_sfnt_off00011902.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 4324 bytes

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