Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd460997c3240652…

MALICIOUS

PDF

80.4 KB Created: 2021-07-21 08:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e39c11942f940a8fff422972d75c28d SHA-1: 37720819d395d5d8feeb088ec4b619683c1ef131 SHA-256: fd460997c3240652e72fb3d8c5bf69ee541369faf76e11a4da11f246a44cad81
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI that functions as an SEO redirector, indicating a phishing lure. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to lead the user to a malicious site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/um1bUVUAM38/square?utm_term=naming+chemical+compounds+worksheet+answer+key PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f45e645f13a15bd8295135/1626627684707/peminobivu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f29fd34f27972c6038feab/1626513364066/l_mommy_speech_therapy.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85e631350b74d2edd18fe/1625841251188/the_supply_of_product_x_is_elastic_if.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecb47f2cc4417c39d4035e/1626125439151/paper_plate_poppy_template.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 11332 bytes
SHA-256: dd14d22bc3282b3b5bd02004d956e8db829713cfb7bc62be45396cf4b36ff46a
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17080 bytes
SHA-256: 29ed715d15654a18c1831f098f8afd4622cca1604d6256b11bd15163209cd541

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