Malicious PDF — malware analysis report

Static analysis result for SHA-256 8886674075f1eeef…

MALICIOUS

PDF

76.9 KB Created: 2021-07-20 17:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 46eebe80dd56cf732abfd4ced84dc0a1 SHA-1: dcfaee78c8cfd4e25c50d3489d1188324058da28 SHA-256: 8886674075f1eeefa2037a19ec524f11ef48c6a72cbd0ef0e8faca387e31c70e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains an embedded URL, identified as a high-risk indicator for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_UTM_REDIRECTOR_LINK heuristic indicates the URL is designed to lure users into clicking, likely for a free download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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://archism.ru/square?utm_term=woodlands+sports+hall PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1930825097a30fc555082/1626444552291/logosutope.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3c90a6c177f33d7a7a98a/1626589450921/the_lstas_complete_credit_agreement_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1eb2f8ccd1957f408e06a/1626467119944/fish_fluorescent_in_situ_hybridization_protocol.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f6444178325d0aebbd78b2/1626752065314/41813051329.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7cc2ad1bf7105ccb1d8e/1626111170244/2_month_baby_vaccines.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 10256 bytes
SHA-256: 6484331f99a82558cb463e3ac28d79386691533a1624814fc643ae2a0638efa6
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 17680 bytes
SHA-256: e56e1c1c5155bf9281456f97281104a023879959b2b78016bf83d469a62ede50
font_02_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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