Malicious PDF — malware analysis report

Static analysis result for SHA-256 da82ba653fd2c8cc…

MALICIOUS

PDF

72.0 KB Created: 2020-11-24 06:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 792f6c206aec91d5fe7887e7a709a33d SHA-1: b314de4e8df00d9498f2c1c9110b32992998f961 SHA-256: da82ba653fd2c8cc413abbbe1818665409c8641ca992b7398720b0246e704ad0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with the primary heuristic indicating a link farm designed to direct users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The PDF's content, though heavily obfuscated, appears to be a lure related to 'ancient egyptian pharaohs fact sheet', aiming to disguise the malicious nature of the embedded links.

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://traffking.ru/strik?utm_term=ancient+egyptian+pharaohs+fact+sheet PDF link annotation
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/773e0a40e0.pdfIn PDF document text
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/ac0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_5fb6ce065715a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5fada9473cf2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/82382401039.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/xezukowewop.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/zawukitokitaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0dcb0f-8ca0-447e-aad1-22bd43075c00/koposujoliwodafojox.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/25970433855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30cfb04-3389-45eb-bd53-62b1d4a6585c/fexiboxofutobidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/volume_and_surface_area_formulas_for_all_shapes.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/dieta_para_cirrosis_hepatica.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/the_hobbit_full_text_online_with_page_numbers.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_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 5336 bytes
SHA-256: 9ce5048be6991be30a1406bd69610b18f71ea54725c52ea1330452e177cab88f
font_01_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 10232 bytes
SHA-256: 0f06a33419844ae9fe2954af11c60cc20cf85fb2553033a423a66b2e63bd51a3
font_02_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16156 bytes
SHA-256: 9963bd14ae440c754d66897cc25bec1c43cbcce48bbec284a873cbca82e49179

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