Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b6ac124ec261eb…

MALICIOUS

PDF

107.7 KB Created: 2021-02-17 13:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a8a26e1f602e3828e5dcf9cadde4783b SHA-1: 3f74b8c230dca2a2e76579cd5979bfc0e71c40db SHA-256: 52b6ac124ec261ebaea9d48ec27e5b2d023d6da87d0b7a905cfdedd31b2249d4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search engine result, directing the user to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+causes+subduction+to+occur PDF link annotation
    • https://cdn.sqhk.co/sebutarukaw/gfggohh/79547580398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ff2909bc7f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fd34dc02ed7a.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/owgfhi2/pesufarapomawuzurogo.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/cHfniaj/6465673819.pdfIn PDF document text
    • https://cdn.sqhk.co/gorigaserata/hdQ1Fhc/wefujutawimilasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_60059cadf1c27.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/hjXW1gi/77035377649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/falevi/top_games_for_pc_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/79677851978.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/kazifupagaxujurizarive.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/cara_3d_warehouse_2016.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_off00015a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 5032 bytes
SHA-256: 0f4bbd613022d4f727e930a390def8c4b23ffd5f30ab7b90b5f24e459c390810
font_01_sfnt_off00016b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B68 12636 bytes
SHA-256: e7101f883b83b7f259da7091e4ca04ca380322c0edba2fe562ac7dca62b545d3
font_02_sfnt_off000193e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193E5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176