Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8ae95c5ddb7444…

MALICIOUS

PDF

101.3 KB Created: 2020-11-23 18:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8e797048ebc9726bef3d069df9cba41f SHA-1: 17ee255107f429404fe280d779347fef0e217d7e SHA-256: 9a8ae95c5ddb74449465f70d39029ecf7ea021db0d36b5f5d7bce5d385cf0158
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded content, though heavily obfuscated, appears to be a lure related to 'Naruto shippuden' and includes a URL that could be used for further exploitation or redirection. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=naruto+shippuden+223-242+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449781/normal_5f9ea25c0e53f.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/nigofapusutowajo.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/5887223.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/8abc429.pdfIn PDF document text
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/lamilalanek-wuvan.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/jovekus/lg_universal_remote_akb72915206_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d500e2-38b4-4883-83a7-84c266d375fe/nanuxotumuxugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78f50ad-1ff4-4bb0-9a08-9a95dfc6cc39/fikid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4dc598c-5d90-42d1-942e-71d4d5476fbb/virtual_image_definition_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4631b5ec-42d0-43b9-ace5-bc7eab9c5c02/i_can_t_edit_my_google_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad24ddaf-52ad-4d2e-ab12-c5f13e7b9d08/66209025418.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/berizimokuwel.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/science_reports_impact_factor_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 21220 bytes
SHA-256: 6cee0f24a4352cdda706bba3cc4d7b164edecc27ba1f3a49dbc3a98575daa19f
font_01_sfnt_off00014dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCF 5656 bytes
SHA-256: ed26a85325265bedf5ccd45be92a96de44f29924050e8fe0632ba5a92b94bd0e
font_02_sfnt_off00016101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16101 11736 bytes
SHA-256: c913f6de733e6a143714d5b9e02e3d2967ed739ee8a7b7880fb472a5df65e51a

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