Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7647b431f6f109b…

MALICIOUS

PDF

74.0 KB Created: 2021-07-13 22:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9798dc4c03fb2a2974d9b9620d486bf4 SHA-1: 5b4b1168fe7af9a67ff9f9abb1219b70ffc85fbf SHA-256: d7647b431f6f109b82902b334b76680991995b2e9326c64e04a8e926cdee5c61
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it's a phishing lure designed to trick users into clicking a link for a 'free download'. The embedded URL, https://pistant.ru/square?utm_term=tall+tales+terry+pluto, is identified as a redirector. ClamAV also detected this file as Pdf.Phishing.Trojan. The ML classifier assigned a high probability of maliciousness. No scripts were extracted, but the overall pattern suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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://pistant.ru/square?utm_term=tall+tales+terry+pluto PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed14a06b40a9602c930ce8/1626150048695/muwizanunaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edd137c450ee47307d6bfb/1626198328071/indirect_coombs_test_tube.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9151f6fc466b5bf4544c/1626116434017/wujumurekuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb406262c1d401136d55c/1626190854505/seven_rivers_in_africa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec84b120781e4bb11c0134/1626113201738/pomamo.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_off0000c241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 10224 bytes
SHA-256: d05db8219502b977935e98d13971b0fe4dd2cf18c5bbba53bed2433f5b43bce6
font_01_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16392 bytes
SHA-256: 7c3b83154b4c4ea7fb6f5310c12bfc84c02f7e4f9c1ee26a8cce4421a3a0e046
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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