Malicious PDF — malware analysis report

Static analysis result for SHA-256 003da9d1bb0d4283…

MALICIOUS

PDF

72.1 KB Created: 2021-02-28 13:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 90206b8e830bd9597d35ad1c0d0fdde7 SHA-1: 5e3eb2aa4d0e0f1c1c2e83dc3ab0d06bf43e13c6 SHA-256: 003da9d1bb0d42838147c1724f58d4f1e367999078123c3cfc991e7089aa563b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF SEO link farm. It contains numerous external links, with one pointing to 'resalured.ru', suggesting a phishing or malicious content distribution attempt. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a likely attempt to redirect users to malicious sites.

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://resalured.ru/123?utm_term=battletech+computer+game+tips PDF link annotation
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/4846875.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/66983710084.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/fd4dc721f445.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/nokuvojobevelenituxu.pdfIn PDF document text
    • http://physcoo.com/17790483181rtzvl.pdfIn PDF document text
    • http://zopaxonurur.iblogger.org/2._7_graphs_of_rational_functions_answers.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/velirebuxiwalunugonuxefu.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/8730867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fe4f0c243650.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/tometubufimopim/1468139341.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/wheel_of_time_amazon_trailer.pdfIn PDF document text
    • http://fozabenisos.epizy.com/collecting_data_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/82165256392.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/38843822540.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/80193813565.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/34997237499.pdfIn PDF document text
    • http://pinakebe.rf.gd/mhw_longsword_advanced_guide.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5396 bytes
SHA-256: 1a5fd47863a8a494f3ffa75744b7a9c24e785e43c4205b268df53a2435cba6fd
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10632 bytes
SHA-256: feaa9e49b099b5970b135c30438a17b9a07edae8617dd9424e1c749e68df6f21

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