Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f643c2aebd96ece…

MALICIOUS

PDF

76.0 KB Created: 2021-07-14 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 09850c8d1bbbe6f8037215e90d9fdab6 SHA-1: ae35bd5c0e963836b52cff35c2412c0e97719efb SHA-256: 9f643c2aebd96ece5c9fa0db187730e60db517c1a96d1e8c3b27aba94d3edc94
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a phishing lure, using an image to redirect users to an external URL. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's output suggest malicious intent, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/UZrB20b2Dcg/square?utm_term=heaven+hell+dio PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80383872c4c6263c674c7/1625817987591/87895530213.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee3bbb8feeeb055d99d9a3/1626225595554/show_me_funny_videos.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8334685664d35b0eb1e42/1625830215055/what_does_gratitude_mean.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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 17280 bytes
SHA-256: 5328b2c844aaaf40012631a2ccc6766e2d44aca5fa65d0f71145503ab417f0a0
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 10036 bytes
SHA-256: ebf2683fddca287e69b4fc7f081a876382239409c2dcdf136633797f60fe6050
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1