Malicious PDF — malware analysis report

Static analysis result for SHA-256 5913f9458f3bb426…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 23:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e8c2876602cc1c3aebf4db19f3d85fa SHA-1: 705dd592dabbe61cf5a61b393bc3dc79aef693be SHA-256: 5913f9458f3bb4268d712a3ec769ce84784c1bcb56d76a9b97d9dcfc9bdbdf6f
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with the primary one being `https://jacksth.ru/award?keyword=concave+mirror+ray+diagram+worksheet+pdf`. ClamAV and ML classifiers indicate this PDF is malicious, likely a phishing lure disguised as a worksheet. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=concave+mirror+ray+diagram+worksheet+pdf
    • http://podeves.xyz/jodebujimoruluxivauc1sh.pdf
    • https://cdn-cms.f-static.net/uploads/4369142/normal_60334d7ed3566.pdf
    • http://stroy-level.ru/what_to_ask_at_the_end_of_a_nursing_interviewfwnm3.pdf
    • http://invitesistem.ru/big_data_analytics_definition_deutschtrv5d.pdf
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/9924280.pdf
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/6351428.pdf
    • http://tk-time.site/gajolebidwxabm.pdf
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fdfa0d64def6.pdf
    • https://cdn.sqhk.co/putuziboki/OBRihia/screen_recorder_mac_no_watermark.pdf
    • https://cdn.sqhk.co/zopizote/HYLjfYi/20936992854.pdf
    • http://boomua.site/mechanical_keyboard_amazon_prime_day3y57t.pdf
    • http://gachihyper.xyz/kufapalusabossdb4k.pdf
    • https://radugolun.weebly.com/uploads/1/3/4/3/134367443/1458369.pdf
    • https://cdn.sqhk.co/kexofebiziv/jc3Rgdt/galaxy_invaders_alien_warfare.pdf
    • https://cdn-cms.f-static.net/uploads/4427268/normal_6052c20e8208a.pdf
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/gagigapijiwudu.pdf
    • http://nyvelsets.online/what_draws_out_pimpleswhkit.pdf
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fe10c6a01389.pdf
    • https://cdn-cms.f-static.net/uploads/4466657/normal_6053b13f4f572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kigavanus/58770661989.pdf
    • https://s3.amazonaws.com/kabisebax/keroxidirezomoberukuruzox.pdf
    • https://s3.amazonaws.com/sajatofubote/nefajerukowigi.pdf
    • https://s3.amazonaws.com/pevarijidasalop/40157969262.pdf
    • https://s3.amazonaws.com/rewepalazamiso/ejercicios_de_porcentajes_para_sexto_basico.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_off0000e69a.bin
6aadaa7ea4d94c3c6d712fb75e068c33c28d8b0d82d14c3228c9b807186f7261
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 5760 bytes
font_01_sfnt_off0000fa34.bin
f9f363be1995e6b50c245f7975eda7f7bbc8afbe852d3e8b369d7d62d283fd10
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10268 bytes