Malicious PDF — malware analysis report

Static analysis result for SHA-256 0243ed155a521403…

MALICIOUS

PDF

83.4 KB Created: 2021-05-27 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 014247095d0f6ad6e7c7b138ca100832 SHA-1: 6eaf697f9f1990d09884a03c316c8a0c7463addb SHA-256: 0243ed155a52140379c6c4ebf653b8401c203debba66dea88e7a4142f924e96e
156 Risk Score

Malware Insights

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

The PDF contains a URL that promises cheats for PUBG Mobile, indicating a lure for phishing or malware. The PDF also contains a large number of external links, suggesting it is part of a link farm designed to improve search engine rankings for malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=hack+pubg+mobile+pc+cheat+engine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458421/normal_60436088ad61c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fefe5699f077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5fde7352286e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffcf6ed4f4e3.pdfIn PDF document text
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/julele-widajekewemix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_603a605be6abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_602442a8ee0d2.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/aeee899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_6027f13cadaee.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/7482748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5fcc57e37ee7e.pdfIn PDF document text
    • https://resudejo.weebly.com/uploads/1/3/4/4/134471902/xakenenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f815dcd9-ef1a-4288-ae23-d2ae5fc63b47/brene_brown_vulnerability_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba5582f-f189-4362-ac9d-430243d74795/how_to_use_a_magic_bullet_mini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6255cc79-2a92-4e40-b6f9-6e258a578308/mijuraresuwewasawero.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5236 bytes
SHA-256: 889850ea6ce78a30a26f5a6a5203d96cde7f7514c7031ade7026c9600ed99948
font_01_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 11776 bytes
SHA-256: d1fc09384b2dd2e07bc4bf4e1550853a698793075c50df4f766c32a3cf6b8174
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16592 bytes
SHA-256: 5cda21271a8eb03623080776b081159d9b1a4053905909bc5a937dc040eee1ae

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