Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82fe8eadd3b0d79…

MALICIOUS

PDF

97.8 KB Created: 2021-07-21 11:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b0b0cf12189b26c97f6cc2a5de2866fc SHA-1: f040661d8f6053d6a0021d60297846bedd3e84aa SHA-256: b82fe8eadd3b0d799152f632e67d1fccc2a5006a067c151cc10e240d257d7f52
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains a high-severity heuristic indicating it's an SEO redirector for phishing. The embedded URL, https://huntic.ru/square?utm_term=eve+online+ore+ships, is likely used to lure victims to a phishing page. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/square?utm_term=eve+online+ore+ships PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f54243ec5ad00cc0a6c299/1626686019619/book_wings_of_fire_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0593acd60116a3c37aa70/1626364218374/4x4_matrix_determinant_calculator_with_steps.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f36adfdb752c5e49acfc35/1626565343938/holiday_skin_pack_2015.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e260dc37083541b579d4/1625875040626/swot_analysis_of_dell_company.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f7670c18cc320cf57cd0bd/1626826508691/4638832481.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 17020 bytes
SHA-256: a6f3a68630927099e6b04b982925a61219132e3ba4d86a8c28d31ac7e553371f
font_02_sfnt_off0001651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651E 10136 bytes
SHA-256: 25bf93bfaf0c3bafe88aa2633a70a01678310776eddfc41cbfc293c1cd8e368c

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