Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6a91eb5f75305d…

MALICIOUS

PDF

88.4 KB Created: 2021-01-15 13:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 71036c4728fd71f611705aa4e6b6bdde SHA-1: a5ba2aff62bfdf13e320b11793e12a64a8099a33 SHA-256: 4c6a91eb5f75305d288b9072384f5e0bf8e58bb586682657db4c36b38a06af35
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 detected as malicious by ClamAV and an ML classifier, and it contains an embedded URI that redirects to a suspicious URL. This suggests the document is designed to lure users to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and embedded URL are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://traffnew.ru/aws?utm_term=constantly+report+%25E4%25B8%25AD%25E6%2596%2587 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ffce022b6b23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5ff8d396e138b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_5fbc6a0a2a679.pdfIn PDF document text
    • https://site-1204796.mozfiles.com/files/1204796/soxesugopofedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f8f35d315514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f94ec261561c.pdfIn PDF document text
    • https://site-1176752.mozfiles.com/files/1176752/best_auto_reply_for_whatsapp_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fc35318b21d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd28a1d5db3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fe6794020dc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff25a78d2b53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lorerexeg/root_apk_for_android_6.0.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/action_bar_android_transparent.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 4000 bytes
SHA-256: 56b08b964aab5cd2ffcf25d044ccd7c2ae46bcb6fc293ef29a464535098d563d
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 3112 bytes
SHA-256: 31a7c526988a7be2ccd0a44e21e48c33e90714b14e453b0dad9e2e322c4d8857
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 4676 bytes
SHA-256: 35dcd5200c238e825153dea70dfb6b7dd6ede6dd813d0c7c7b8e6ffd30dd19e4
font_03_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10896 bytes
SHA-256: 2725adba1b1d08587bad93eecfec4bc12139c5f4c773b611b213f4dff648d1fe
font_04_sfnt_off000143cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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