Malicious PDF — malware analysis report

Static analysis result for SHA-256 960a9be2d79d1e84…

MALICIOUS

PDF

69.7 KB Created: 2021-03-12 21:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4ac0e17524bc8c01bfb4f917c8b83c4a SHA-1: 21ea9351b2972db423fa6268a778ef1edbbaed2d SHA-256: 960a9be2d79d1e84d484d3d686f5828346300d68722e6a17ba1452c49cdac329
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to benign-looking documents, but one prominent URL, 'https://leonvi.ru/award?keyword=api+527+pdf+espa%25C3%25B1ol', is flagged as suspicious and likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution lure.

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://leonvi.ru/award?keyword=api+527+pdf+espa%25C3%25B1ol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5ff53f9a9fd48.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/aNicgjE/36892450342.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/364a478dcc7.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/iehaJjb/30875107025.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/8459795.pdfIn PDF document text
    • https://cdn.sqhk.co/donaxewon/hgdigz7/gujosowad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6023468798de2.pdfIn PDF document text
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/zimerip.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/tonisefoteka/55983594741.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_16f292801cca4da3b5fa139c5abe634a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wayne_dalton_torquemaster_plus_torsion_spring_replacement.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_677fa361b54f4280bd6df6480d1767ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/doctor_letterhead_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/ccny_registrar_forms.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_c627a038e63d4d8d93c85613ac75cb4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/michelin_guide_paris_seafood.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 5476 bytes
SHA-256: eecc45ba15804b140f575313f086e8906d3e509c8cec56fd754ed8c9220f87ef
font_01_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 10240 bytes
SHA-256: 0fe611ca2ca5b83fce4ff24b3fdbe5d06872bcefadbfee2a435822dd8700c4f2

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