Malicious PDF — malware analysis report

Static analysis result for SHA-256 8361d88ee6df8413…

MALICIOUS

PDF

89.8 KB Created: 2021-07-14 01:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: ddd9bda62091f331a70d780a7ea34c47 SHA-1: 824203e783fe4dc85c7d20b8ce7f2f19282c6ccd SHA-256: 8361d88ee6df8413819da42090bb025698fd6f29d97c8b23caf14215473ad68e
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that points to a suspicious domain, flagged by heuristics as an external URI. While no scripts were extracted, the presence of the embedded URL and the ML classifier's high confidence score suggest a phishing or malicious redirection attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8322

Heuristics 4

  • 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://krisoc.ru/square?utm_term=link+rel+canonical+seo PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8b8feaa19e084bc1faca/1626180495740/57598381997.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76a3433fd1509ab6ea02e/1625778740455/palukagafujeli.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8fce840a1961e7b87c7f/1626181582509/lol_to_print_and_color.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec792a154eb17b6848eef0/1626110250183/use_rewrite_in_a_sentence.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ede84f4c056a31b81c4119/1626204239099/download_procreate_on_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e85029979f1a622c7e1a76/1625837610117/fruit_compote_for_waffles.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 17836 bytes
SHA-256: ec8a3c2c415b199ab0fd86e13b02a5f495514d84bc1aac373803d3b17523ae94
font_01_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10172 bytes
SHA-256: 0d2b264840e715070207d72a0accabe283ec5379da117e13340c56acc64c1935
font_02_sfnt_off00014366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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