Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9434241377aff65…

MALICIOUS

PDF

74.9 KB Created: 2021-05-20 01:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 08f6573a348b33b6beaaf70d7ee0ed6a SHA-1: 66a6a57c9ad9d496ac69a28422c524b42ec204b9 SHA-256: d9434241377aff65ae112248297a1f9773c77b4f4d1b539da72616ffa3f73677
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lead the user to a harmful destination, consistent with phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=what+are+your+child%2527s+greatest+academic+strengths In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fe2d113a2915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_60077d0c53e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6031fcd4eee09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5fcbbfeeb0c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5fd816929d7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_60120f2dc0eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ff91f9480959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_602b3cbc2b639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_605fa0a8ce970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_60383ea8ea26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_602c803586221.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/mekonulegipero/tudamubetam.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/shopify_furniture_store_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/how_to_make_an_outline_for_a_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/93663651278.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/troy_bilt_tiller_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/felalop.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/99917374835.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/zopuronun.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/bachelor_party_new_orleans_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/17956770368.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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5500 bytes
SHA-256: fa0c9c83bf7a878a17820fdb2bd46341343f6c2559dafe87a64bffae8b1a62f9
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10336 bytes
SHA-256: f3ea134723d3fddc92a525ae358bf10d9573ed71521ed9ef1afe14a4b99efaca

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