Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b24f50b392e7cd…

MALICIOUS

PDF

80.6 KB Created: 2021-04-17 17:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2a26fdecf987b8547fbaef50383dd0e SHA-1: 158c60379138b40fb801e7deca1f410735d39004 SHA-256: c4b24f50b392e7cdce6e74015e8eeebdb925462a4c367cd5e24bb8004824cc32
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to dream interpretation, likely to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+is+the+meaning+of+eating+apple+in+dream
    • https://cdn.sqhk.co/rasufizo/39oIRji/90332848694.pdf
    • https://cdn.sqhk.co/nufomewo/jbhhvie/6465632419.pdf
    • https://bejelopaze.weebly.com/uploads/1/3/2/6/132682113/femuxemu.pdf
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/juvozisofe-pomanado-gavidijaro-jabujimamowim.pdf
    • https://cdn.sqhk.co/fuvebopeweb/hCkgggf/whatsapp_chat_wallpaper_iphone_hd.pdf
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/12394.pdf
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/kozivota-raledivev-mosumuvam.pdf
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/d50b9f18035.pdf
    • https://cdn.sqhk.co/zimuteraf/Rhechjg/fishing_legend_hook_remover.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_2abed527c40644508135a0211efa13e7.pdf?index=true
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_e350c97cca094c01872a3758c8008f01.pdf?index=true
    • https://s3.amazonaws.com/kiremefegonar/pagobigefuve.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_d6241522004f46fdb376d46a67ebac41.pdf?index=true
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_8f0c115fd0ea4ccbb6a9e7915996e271.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_cbf610c83f2142bd8c3486e987c2fdf6.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_526f4d2f82d6448485dd9d96d3628dba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa44b18b-131b-4afc-a398-0bcac8562793/naruje.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_e13829bb28794650999dd6dbe0f3d5c5.pdf?index=true
    • https://s3.amazonaws.com/wifukedot/lofafigewixipubuj.pdf
    • https://uploads.strikinglycdn.com/files/cc76a933-8bf1-43fe-86bd-43dc99151ae9/sasuwulenono.pdf
    • https://uploads.strikinglycdn.com/files/0a27d343-6401-4fac-87a4-50499a56cf4e/gadatuvokopibese.pdf
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_3d05baec40a644a19776bd7a0c47a300.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin
4e4c82319e707c9f7eb701924e0840f43825d6c8e3346585f648610ed6867dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5256 bytes
font_01_sfnt_off0001015f.bin
78743eeb28876a7c724ee438a5debcb5378435495579e728e0955acb84d535c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10912 bytes
font_02_sfnt_off000126a8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 4324 bytes

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