Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecda8e26a8483326…

MALICIOUS

PDF

67.7 KB Created: 2020-11-19 15:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b07baff1a742dda1b0692fb30af31ecf SHA-1: 238ac7208e16ce4bdb89f5f3d63c8b7b367f93a9 SHA-256: ecda8e26a8483326be38fdaef613a970e9a7ab62251990a0acaa765baaaf28d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/123?utm_term=give+me+liberty+4th+edition+pdf+download PDF link annotation
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/xapumakikadute-jaxabulogulifam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_5fa9a6907b694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f93cb4063609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fa7f7de95123.pdfIn PDF document text
    • https://bozexiwagufib.weebly.com/uploads/1/3/4/6/134695017/7889998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_5f93b6a42f230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e79564e-544a-44c8-92b5-a768054efcf8/hypointense_on_t1_and_t2_mri.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/93465828936.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/emergency_preparedness_merit_badge_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/pure_substances_and_mixtures_grade_7_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/54_760_peach_pill.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/70455939363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55471e7e-824d-4d24-8932-9eef1f17a6ad/biwasemefufebufefanedin.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/196212255.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/irs_publication_550.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/gegetadesuresimolowugutow.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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 5616 bytes
SHA-256: 0471db97b17558a974c27f5246c16c6af168515a281b3d9309c2e4b24f1baa3a
font_01_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 10200 bytes
SHA-256: 1d7b5ee9f9c53960f7810f6829749cfdc343225edef13e7fafc951085d21fa44

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