Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e8c819e4ee3b01…

MALICIOUS

PDF

73.8 KB Created: 2020-12-14 12:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 056a58b014b296a997f0da5f81d1ff86 SHA-1: f4d3bd258bd199f76cc93ebe134eed115d12b6d7 SHA-256: 55e8c819e4ee3b016fc9f46d4b4a286e03d5f761adca8a4689264bf8fd19219a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external links, including one that acts as an SEO redirector for "midi to music box sheet". This suggests a phishing or content-luring attack. The ClamAV detection and ML classifier further indicate malicious intent, likely related to distributing malware or facilitating phishing. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6646

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/wb?keyword=midi%20to%20music%20box%20sheet PDF link annotation
    • https://daxedinojadu.weebly.com/uploads/1/3/4/5/134590150/mijurulunejotitofuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fa21f9bc2f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fad451ed3fb3.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/58a129d0be5a8.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/77d1e4df-5f9b-4c68-8e79-ba562edf8c61/62781547132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dcb3f0-4549-4626-a4ea-04e0294bed04/completa_la_tabla_con_la_forma_correcta_del_pretrito._quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcca07f9-ad91-4329-bc82-2253dccfcdc2/pivoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a8ac22-f0ea-4dd0-9568-ceb9bf4f9f08/highest_ac_5e_level_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f636b656-9988-44f6-971b-d57140f24e1b/aldebert_quand_tu_seras_grand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0087b0a3-d6f3-4926-b4de-982ea5a2e9e8/kufeweweratixuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c587de-32fa-417b-8882-b609246cd273/breaking_the_genetic_code_worksheet.pdfIn 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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5052 bytes
SHA-256: 6299c7e18e10baaf1a9a41cde8576cc9fc0cc97e77ff3f89371292672c23a8da
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 11068 bytes
SHA-256: 1586acd3f72b74794078a98429b0655f215d340842cf9f8a38d9aca1f2c149ed

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