Malicious PDF — malware analysis report

Static analysis result for SHA-256 365f7b6047ee97a2…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 21:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed111a2e195196b58f19128a2a9f0ca9 SHA-1: 52ed73feb63faf921d14494e493653bcca7d79fb SHA-256: 365f7b6047ee97a2affbb8e0f7b3efa6eed827d8ac06b7c1393e0c4e71403d8a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to lead the user to a compromised or malicious resource.

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://kuzutuzo.ru/strik?utm_term=how+to+find+compounding+periods
    • http://dikebar.22web.org/7965973443.pdf
    • https://static.s123-cdn-static.com/uploads/4384821/normal_6009663532577.pdf
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/buravusulux-werux-solovinix.pdf
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6047b44cee9c1.pdf
    • https://cdn-cms.f-static.net/uploads/4418972/normal_604d2b939bd0d.pdf
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5fe642bd66701.pdf
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/kododewade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazorixekunafob/angular_material_side_menu_template.pdf
    • https://s3.amazonaws.com/mixanaz/88399667451.pdf
    • https://s3.amazonaws.com/xupimaral/87191639509.pdf
    • http://sutekotuluzuwed.rf.gd/dnd_5e_best_classes_for_each_race.pdf
    • https://s3.amazonaws.com/widiku/93233305959.pdf
    • https://s3.amazonaws.com/remavuj/60705631286.pdf
    • https://s3.amazonaws.com/viregujipowuru/62733837537.pdf
    • http://bedozev.rf.gd/12697716821.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/damesekemulopetexivugub.pdf
    • https://s3.amazonaws.com/vukusa/magobosanigepe.pdf
    • https://s3.amazonaws.com/paxuvagal/82265635349.pdf
    • https://s3.amazonaws.com/nilafafakem/ellipsis_exercises_with_answers.pdf
    • https://s3.amazonaws.com/dukavunivifa/49255532138.pdf
    • https://s3.amazonaws.com/mudurixo/xetixexijivenire.pdf
    • http://satalinev.epizy.com/75296114586.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_off0000e6d0.bin
4c4ebfdf85c3531b4ba5b6a937f48b75a8192de5891b777326b1ad1521effb21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5284 bytes
font_01_sfnt_off0000f8d2.bin
1ee2483a9dc73af3a3808f71a185ebef41b5f88ba22c3b2cb525a526205aab41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 11348 bytes

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