Malicious PDF — malware analysis report

Static analysis result for SHA-256 e534b5d21f3d0a79…

MALICIOUS

PDF

111.8 KB Created: 2021-07-14 00:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3523cecc1eacd96ab4fdb6c1a6f497c4 SHA-1: 109df2560eb2a0ebaddbcf34afd191297805a5bb SHA-256: e534b5d21f3d0a79a259c756bd56b659ef0475d85f42717901745e9945c1d27e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it uses a redirector link for a free-download phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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://feedproxy.google.com/~r/sq/ugae/~3/cEZ-xJcQpFE/square?utm_term=last+shelter+survival+hero+formation+guide PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edffc6c6126f45c3e593e6/1626210246392/5871225114.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e925633ba7d954d5465967/1625892195280/perimeter_and_area_worksheets_for_5th_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edff018e89d93564d87b4d/1626210049325/jizanenitexegalumulukidar.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e84bdc0770ad4d9ffa2b28/1625836508892/baby_x_bottle_warmer_how_to_use.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec89520d838b6c850d87bd/1626114386167/how_to_add_text_in_premiere_rush.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_off0001519e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519E 10924 bytes
SHA-256: de498bc96d15aa6f4df717ab15293b49c2556818f1150351c4641f55e6766344
font_01_sfnt_off00016a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8C 17952 bytes
SHA-256: a3e772548f96097d2e92b107ebb4254ffab3c45522266adbfb2cf2687842fb42
font_02_sfnt_off00019996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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