Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d8ae9ce1551d5d…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 09:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 20e56f22332489eda7746496cbe38d7b SHA-1: 3d3b39c8763dc89c8b72c4947a11d9c9c6d776c0 SHA-256: a8d8ae9ce1551d5d07299ff80619b43cd1fb4c3b58cebb778bbe4ad46b9496b8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly and other free hosting services, characteristic of SEO link farms used to distribute malicious content. The presence of a UTM-tagged redirector URL suggests a phishing or malware delivery attempt. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=cut+the+grass+french+meaning PDF link annotation
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/bumilan.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/3140638.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/sNchbYX/solar_system_easy_projects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_6016034c9686d.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/fafavexalefebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5ffa0cd1e9c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407986/normal_5fdf8f9c7fb63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b029b1997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5febdfb938207.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/35ef840f362b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60173832de2e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffe292360e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fecb3a274279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezajunezu.rf.gd/mosisanofoba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 5168 bytes
SHA-256: b9f2ab4760fa75866bdec24016a78b28d625e3e34e9d04fde24d4ffb2e457163
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 11792 bytes
SHA-256: c8b90e6a6d5a6a3e8f7a30d24af9aec7dabd0db4ea499a19829998a1bdaac0e2
font_02_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16068 bytes
SHA-256: bff620efafd19347b267d395afbaf496ecd82cd7772b41387cd2beb5a1750540

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