Malicious PDF — malware analysis report

Static analysis result for SHA-256 548891fe89e6c886…

MALICIOUS

PDF

74.9 KB Created: 2021-07-12 22:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7824ed36ebdfb50e4ab7832351bb657e SHA-1: 3aeb391b91bf40ca316d769f08e8667e2d6d44ce SHA-256: 548891fe89e6c88611743b03e6f91da33934390c28c19d9f8ee1cea12bd61fb3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high risk score and ClamAV detection indicating it is a phishing trojan. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing attempt. The ML classifier also flagged the PDF as malicious. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/eoPDrVzwpx0/square?utm_term=my+puppy+keeps+sitting+down+while+walking
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7cf0df29cd6423db3e7fb/1625804557769/stravinsky_concerto_for_piano_and_winds.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7fbafa40056e74d1d542/1626111931060/39649975884.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8c5ae0914637f38b6b08/1626115162523/how_to_edit_that_is_password_protected.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c5.bin
7d578a8b4b37a6985137471616f2dc7876093cdfd8fa0e350e4276ce6cb5c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C5 16164 bytes
font_01_sfnt_off0000ee5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16792 bytes
font_02_sfnt_off00010672.bin
e3495d1e191f4a350339defd168ffa85ae9ba70d0894dc9607d6ace967bc5199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10956 bytes

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