Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46cd9249843e1d2…

MALICIOUS

PDF

72.3 KB Created: 2021-07-14 07:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 348c73717e85549f3a45c61bdd08d17e SHA-1: f66eaf847ee39934cabcb87f74f342638980d4b0 SHA-256: e46cd9249843e1d251472304dffbee574f94aa62ed3f359ba928e6e1e9c97477
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates that an image lure is used to redirect the user to a URL, likely for phishing purposes. No scripts were extracted from this sample, but the PDF structure itself facilitated the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7049

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/pL_UGxDroB4/square?utm_term=placentitis+in+humans PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e837d2a431ed42d2ffc1ad/1625831378539/tenejisave.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9529bb68d8f0f4bf9d112/1625903772098/tisesusuduberu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eca92d7d354a5e86a68e45/1626122541884/wowukam.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_off0000be43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 10376 bytes
SHA-256: f9e7a5ffc71e3d454c1a4947a27d90717af388287f96ae4643fd3c6d1161b585
font_01_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 15580 bytes
SHA-256: 1c4352c5db7d99bedd011585fc7b28918699b1de471c5c64d0bd7c6d4e09cb30

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