Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08edb5d2b2da194…

MALICIOUS

PDF

71.5 KB Created: 2021-02-11 07:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 15528a24f5502e3c8eb6edc1b00a47aa SHA-1: c5f467c3edb3eac0adcf6cb1800ed8da9fcc4015 SHA-256: c08edb5d2b2da194d2cba3d91f7c78fc099443e91712584bc7a398c4a3424ee1
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The presence of 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics indicates a deliberate attempt to create a network of links for SEO purposes, likely to phish or scam users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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://druttle.ru/123?utm_term=ap+human+geography+urban+dictionary PDF link annotation
    • https://cdn.sqhk.co/miloxuso/eSjiBia/88160706865.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/nenuvekadilufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fdabbe7e9310.pdfIn PDF document text
    • http://grampus-shop.com/tree_of_savior_mounts1jzde.pdfIn PDF document text
    • https://fupozivu.weebly.com/uploads/1/3/5/3/135316658/pigetexusix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_6012fbfc86120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fe4e47dbbcc3.pdfIn PDF document text
    • http://oneplusonemain.xyz/rejolexagosabamlead4.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/gogogij-nefelu-jukime.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/kotodur/change_fraction_to_percentage_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/avengement_movie_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/kosozipepananofaxubemon.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/47555977945.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/wavakikevalok.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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 5508 bytes
SHA-256: 2c7e612492b771936a6f8ddd106c0503db637052f7080d321e788a3be653c451
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 12524 bytes
SHA-256: ca193a4aaf71139d2ad41d95c59d8d9061b307413bb2d1bc4c952bb5ec0e9c18

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