Malicious PDF — malware analysis report

Static analysis result for SHA-256 10231e77477715d8…

MALICIOUS

PDF

87.3 KB Created: 2021-01-24 23:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1d68de50bec38ef6580948ef74efa6c0 SHA-1: 8dbd5b5cd03decfeb1f35d4ad6d6a48e17f841ac SHA-256: 10231e77477715d84f571ad833e3a59a7231983ac9b126d3d9523def84f42852
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. Several of these links point to potentially malicious domains, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious activity.

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://traffset.ru/123?utm_term=windseeker+cedar+point PDF link annotation
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/jidelagugogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5feef9c91ffa9.pdfIn PDF document text
    • http://bt-management.website/97679405021ocffy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc6b4f11e3.pdfIn PDF document text
    • http://8gusevshop.space/popular_car_driving5c9lm.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/gibika-tisat-xonufadu-gemitalakox.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/tewojosekaborug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff1fc6d1c9d7.pdfIn PDF document text
    • http://digitalmedialit.com/81779125197smm0c.pdfIn PDF document text
    • http://magic-spring.com/zaxabuxiwavdmsmx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fed7977503c0.pdfIn PDF document text
    • https://pupalajapifev.weebly.com/uploads/1/3/1/4/131454396/miluvijilufugebakat.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/legenapi/66049122453.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/invoice_template_iwork.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/21007029904.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/russian_language_learning_books_free.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_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 5112 bytes
SHA-256: 6e76fe4a63a2c6239044e2c9b627d577a6806add5dda8aca4102b1212f25bd31
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 13392 bytes
SHA-256: fb22a5fcfa84639db7da844a02f92b7c6c257d301105d3b4e91520d62956395d

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