Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6731b8a4dd02ab…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 06:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46b53b24559e14fed193a7432c0481d4 SHA-1: 7d1de940fac5196eaa4709e8702e9e26d04a696a SHA-256: 9f6731b8a4dd02ab4316302ca85dca39d467d5990f2eae652be0a989995304d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. One of the primary links directs to 'jacksth.ru', which is likely part of a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/aws?utm_term=adobe+photoshop+express+free++for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5fc966ecd08de.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/205ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374199/normal_5fe5e7cd68bfb.pdfIn PDF document text
    • http://guxiket.iblogger.org/businessman_telugu_mp4_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_601f8ec68f82e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_6008cdfa079be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5fce9090f1f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470687/normal_60015f7772361.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/durapelonivaj_soruxaripudop_visujatefowabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fffa6f639746.pdfIn PDF document text
    • http://yellownatural.space/81550426334n41sg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471710/normal_5ffa1fa545450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcdfde1ba98e.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/voxipanovigepiv/zarojebunuxuridixidato.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/52115273234.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/schengen_visa_france_application_form_vfs.pdfIn PDF document text
    • http://vovivufevalo.rf.gd/font_barcode_ean_13_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/88326660648.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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 5292 bytes
SHA-256: c28353c14e86cf515ffd999c6c45b3ed24a8277d1a104ba8866e186ce33adad4
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10664 bytes
SHA-256: c3bb1669c8ead2ef3791489dc31478d10712a7c75c0a970b4764ba80632dcc10

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