Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bb87821c90aa74…

MALICIOUS

PDF

74.0 KB Created: 2020-12-28 09:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7a981a517fd85cd22b6511394425119b SHA-1: db261ae1936724c31351e4763b8b2729774ce726 SHA-256: 64bb87821c90aa74f7d03abca8ad96adb42e8e47b527377332e2099eaeffcaf4
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external PDF files, many of which point to a redirector service. The presence of a link farm and a redirector suggests an attempt to obscure the final destination and potentially distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=geometric+sequence+practice+pdf In PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/febifunosogosej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fdd416db4d3e.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/jozaponi/vekoxakivupojuze.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/turar.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/astm_bolt_torque_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/88525750541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c726bc-d05b-4075-8d4b-8db21f859db0/subavebozifu.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/caller_id_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213d366a-9905-46ba-9550-ade8a27362f9/83266310563.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/tuxisi.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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 5424 bytes
SHA-256: 397d9d73a565926a04cb57e19e558e85877eb16117788562ea3d0a765ebde57d
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 11672 bytes
SHA-256: 17d28dc6e835d853add9b20ff3f6e6108019197ceb51c8a7500351a5e1a334fc

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