Malicious PDF — malware analysis report

Static analysis result for SHA-256 9357adbfafbba59a…

MALICIOUS

PDF

78.3 KB Created: 2020-12-17 09:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 17ae0a5c87342e7923bea4e7455a3770 SHA-1: 4cd6c84d5ef030f7734e4507527c34f2797d1b3e SHA-256: 9357adbfafbba59ab105f03346b047d4219671290881f18615e43b406fab78f4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. Heuristics indicate it uses an image lure to redirect users to an SEO redirector, specifically 'https://trafftec.ru/123?utm_term=caesar+life+of+a+colossus+pdf+download', which is characteristic of phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and URL suggest a phishing attempt disguised as a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • 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://trafftec.ru/123?utm_term=caesar+life+of+a+colossus+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fd2e08e9098a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f9d0c0b630c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5fd78a10008df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8b615f87855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fc45d4177d8c.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/sepovutapakogaf/nabexabamuluxolas.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/ladoletavavodopuzuwufube.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/wevufagalukud.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/acronis_backup_12._5_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/carbapenems_en_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/vifuvukajawijokew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ab1b88c99b6d37c7dc09/t/5fc86c2613f8d93bf204a423/1606970410190/zijenovina.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3655816f6d44b07ce9520/t/5fc78345c7c45a5eafa8ec83/1606910793572/strategy_meaning_in_tamil_explain.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 5148 bytes
SHA-256: d28f211930a7e7187a34254f2e0236aac8259644c76a6c10ceac3a457642baa0
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 10944 bytes
SHA-256: fe1ac416f31d18f2e5250891a091336676811ee612a46534bfb8f559cd36b7fc

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