Malicious PDF — malware analysis report

Static analysis result for SHA-256 85565417eaefd8e8…

MALICIOUS

PDF

78.4 KB Created: 2021-05-21 19:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41d76ae216f8476706bd5bc00ff580f0 SHA-1: 9e508ae39fa5d9ca922bd66a7d9c60b1d250af37 SHA-256: 85565417eaefd8e89be99defc512a51d4ccca36f41873ee74c9d3e7ee1f68895
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://druttle.ru/strik?utm_term=what+are+the+3+goals+of+criminal+justice+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458163/normal_604f7bfa6109a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_604b2001d6b8d.pdfIn PDF document text
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/jewasakuxuriva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66fbec8a33.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/f38bb7.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/2877491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_5fd1f7f16fcb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365613/normal_5fe48187617cf.pdfIn PDF document text
    • https://pugulabojoxo.weebly.com/uploads/1/3/5/9/135993792/zotamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_600ae9ac73d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_6029c4e2d75d0.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/fakuguvil/55380998567.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/46043855994.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/lutesalagubovudubipoluv.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/nulovatifojalezuluruse.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/accelerating_admixtures.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/61148464960.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/monthly_calendar_template_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/what_is_the_journal_entry_to_record_accrued_expenses.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/zeluzo.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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5652 bytes
SHA-256: a335330433e51bd6d76a48b177e6f9c2c1cae8494596794453a1b6f4c067f6e3
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10232 bytes
SHA-256: 4dfd01409fa3a94fc0a6a664b8acddee088b5aef6cf05c8cc6ee4cb9927bd843

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