Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57c26ed195ec036…

MALICIOUS

PDF

96.6 KB Created: 2020-12-10 06:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8ef61e2b1aa80bc2252fa8afe6607951 SHA-1: e48e71c7d4e5ded0adfc2f8ee23934c867dac5f0 SHA-256: b57c26ed195ec03641384e5f71c430cf6355344211c72c4135c572c25884e8b1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?utm_term=schwinn+le+tour+ii'. This URL is flagged as malicious and associated with SEO-based phishing lures, suggesting the document's primary purpose is to redirect users to a harmful site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=schwinn+le+tour+ii In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fbabfc71c153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fbee4f700fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5d7b37848ba205d3ab541/t/5fce96d34daf5176343f06c4/1607374547901/80652270116.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce8e0e799940555acba95f/t/5fd167095e090321caa68859/1607558922650/resident_evil_wallpaper_soundtrack.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2d78f3de5e49b52e55d7/1606299000572/pirate_food_recipes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed4f1452f90b7fe57e24/t/5fc5d60b2dd96f5918b7af19/1606800909136/palatuvozaji.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64f46c14dfd36fe165b58/t/5fd0374bcb6bfe602c48fa49/1607481164133/asteroid_headed_for_earth_nasa.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/jowime.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/etica_y_moral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4268a3f7-e44f-4cea-b0bc-917e39b83a88/exemple_projet_bts_maintenance_indus.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_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 4692 bytes
SHA-256: b29c4625cc6600182420862d7b6e905cb178cb927e8f93fa838f31cee3a2ae4a
font_01_sfnt_off0001523e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523E 10648 bytes
SHA-256: bb3cf86569652bd17af56e534288cf39ad087d45672580102295b7ed1bf1918c

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