Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4840914d436cb5c…

MALICIOUS

PDF

68.6 KB Created: 2020-11-16 21:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e0407f75ee19bb44d7136629e527f7e4 SHA-1: 10e6027077e057690a2118305ae3d2fc9e3aa7af SHA-256: e4840914d436cb5c240fe477fa0b97ec999b5300051a049f58acb4dbd1c94fea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The embedded URL 'https://traffnew.ru/123?utm_term=big+bang+daesung+hair' is a primary indicator of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=big+bang+daesung+hair PDF link annotation
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/kusigodavu_malejebuv.pdfIn PDF document text
    • https://rutepoger.weebly.com/uploads/1/3/4/5/134509459/2783092.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/goxobeki.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/9826c.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/f65ef36580e788.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/lalunojib_fibufagixavow_ronotole_kitakejobelufo.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/ramaziv_tizarelune.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/vamujirunevub.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/6d2a0789-e36f-403e-b3ff-43ec70d9772f/nabadilavekivubeko.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/tidutobuzubufibulesikuku.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/baixar_mapa_mundi.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/example_of_medical_excuse_letter_for_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053e6d0b-c391-4536-ad02-204079bfa4c8/motogagek.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/crystal_reports_viewer_dll.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 5244 bytes
SHA-256: f3e9b7705123f73e79cbbbdefb267176b3070ff90b7448f0c20c15c9058a6ed5
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10572 bytes
SHA-256: 3da008b0e39193691714de21b8baa5bbe8478dc75912942ffd0b31d3b913c218

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