Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c5bcc025cc6b19…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 23:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8eb48665c604782cd7f9d7c3631c70 SHA-1: 2fe766524adadbbb9b9ebb6becffac68311efb1a SHA-256: c3c5bcc025cc6b191c3997e2ae2c70067b91a2e3432281c1a7094da379cafd99
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 threat. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to business management exam questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=business+management+exam+questions+and+answers
    • http://zavarivaemvmeste.ru/fifexonekorisebovhtvs.pdf
    • http://shoop-fm.ru/15099319021ujp1r.pdf
    • http://f1l3download.site/fikazikuwek0y967.pdf
    • https://bakemelufipunuj.weebly.com/uploads/1/3/4/8/134888112/9727515.pdf
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/1618432.pdf
    • http://bestsalestoday.xyz/1415264421545n6j.pdf
    • http://salet.store/bawafosozavexizijuvoxepmqwt.pdf
    • http://sberpodarok2020.online/kinodufumuneronajifujudeszh47b.pdf
    • http://rabokomokot.iblogger.org/how_many_carbs_are_in_a_nitro_cold_brew.pdf
    • http://academic-club.ru/582372952078owf4.pdf
    • http://lishop.site/cz_75_owners_manualytw2r.pdf
    • https://zowimebewira.weebly.com/uploads/1/3/1/6/131606727/3475170.pdf
    • https://fegowudabe.weebly.com/uploads/1/3/1/4/131438077/e54584.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7be9a2b4-8cdf-42c1-aaf0-873f0bb83238/will_ps_gold_headset_work_on_xbox_one.pdf
    • http://buximonerivib.epizy.com/axel_vervoordt_living_with_light.pdf
    • https://s3.amazonaws.com/bajapovogam/dipaganita.pdf
    • http://dobevux.epizy.com/98611765510.pdf
    • https://s3.amazonaws.com/sazomo/charlie_and_the_chocolate_factory_broadway_cast.pdf
    • https://s3.amazonaws.com/dovulavavo/ketuxiweketo.pdf
    • https://s3.amazonaws.com/rodakarugupoko/authorship_guidelines.pdf
    • http://lanelebitomutes.epizy.com/sinamopumezudo.pdf
    • http://xeroxuzowi.epizy.com/critical_thinking_strategies.pdf
    • https://uploads.strikinglycdn.com/files/df671df3-c34e-400d-a8dd-4cad87730f7d/all_my_sons_short_summary_act_1.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_off0000f190.bin
938786c9fa8c16277a9bb929d963d357e5ef0ca029b91b402fb576343be1f8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5448 bytes
font_01_sfnt_off0001040e.bin
f77e354637eb9bda68bf09ddd9ebb0af7a473a13827314535e07a6c10fc4e038
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10728 bytes