Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf4227ce300a65a…

MALICIOUS

PDF

77.0 KB Created: 2021-07-17 00:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 27aed4c678d110f7f2459717c2e9cd48 SHA-1: d7239b45240c17d71442c4fba2a519ef44665429 SHA-256: 9cf4227ce300a65a3708a5af8822e88f7252deb7c4f9fc3406424aec2d9972eb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The PDF contains an embedded URI that redirects to a Squarespace domain, which is likely part of a phishing lure. No scripts were extracted, but the PDF structure and heuristic firings suggest it's designed to trick users into visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6911

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/S-4CHg4Qmwo/square?utm_term=how+to+see+other+people%27s+snapchat+best+friends+2020 PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7da97726b430b467a24f/1626111401761/45175793074.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1f421273591271fd29245/1626469409227/kasarudi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1f512a621f47bfcf63384/1626469650298/bajezepi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1f4d3de9a334cc7e02ca6/1626469587602/lanimalerige.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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 15928 bytes
SHA-256: 64c801b79027edb19b4b966a3fb569c8621515048a44e39d327796c85cc5ac57
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11212 bytes
SHA-256: c073c5d725c91bacb059b9923e77e1aa24c72f709d44eda9c10305b31a7fc740
font_02_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1