Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5842dd73310b13…

MALICIOUS

PDF

74.2 KB Created: 2020-12-31 21:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 49301863aec74020ab7d7a7c69b1fda7 SHA-1: 847b409554378a26ff2b8cc5f24ff8f4c77ab18a SHA-256: ec5842dd73310b1317647eb2053159b7fee5757187e7a704c346bd04ff5e4b4f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to redirectors, suggesting a link farm or SEO abuse for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing lure disguised as a free download, likely leading to a malicious site via the 'trafficel.ru' URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafficel.ru/123?utm_term=the+busy+tree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fdb8b58565df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fd04135c8ee5.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/9ibKvNA/sandwich_sudoku_apk_free.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/luxapotajuwekikot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5fdd5b6686a77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fc5a5f0eefbc.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/2d7606d3-fdcb-4f73-8423-76462627f60b/paroles_chanson_des_escargots_qui_vont__lenterrement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1691fe-a0ad-4084-999b-32afcac35112/sonuxonileses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffa2e16-f053-4efb-b4e6-dc20a7775ec0/70469242418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df99dfa-ef17-4ed3-9703-61f95c4426e6/antique_terracotta_hexagon_tiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb20de2-0dd9-49a8-ac48-93cea232c760/fawixufufamogagunatewemaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbbf32c-13be-4bd3-b715-16a923f5a405/nudos_mentales_bernardo_stamateas_gratis.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 8

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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 4720 bytes
SHA-256: 4fc7b1c4c9d44cf0d875ea2498ddd0801adb6a7c41023be20a230904a7b86d7c
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 11108 bytes
SHA-256: 6d42a3546ae9ec073fc14697d4ec77e06742f9e3937240b90a870623189b9c18

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