Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d08fa5c3676e209…

MALICIOUS

PDF

76.1 KB Created: 2021-07-12 22:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b2ffc3fa5bdedb834189d94972e8494 SHA-1: df5e43969c0c8b9031715ebacfa991e7d4065bdb SHA-256: 8d08fa5c3676e20976e8a6f0cb4f2e25309759a3992bb03b58eccca5bfe1ba73
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL that, while currently classified as benign, is indicative of a phishing or redirection attempt. The ML classifier also flagged the PDF as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/gPkW7oTCsL0/square?utm_term=between+humanities+and+the+digital
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e845bc8e76fa73c6605b24/1625834940765/welcome_to_the_church_of_the_nazarene.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e918bb787dde1a90adb917/1625888955599/most_expensive_cruise_ship_suite.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec892bdd2ac847ff7f29fc/1626114347355/problems_and_solutions_on_electromagnetism.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_off0000ca2f.bin
e28fa6e3d8dc262a1edf5e817ae94a736aa1736e17230499d432cea7099fe286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 10716 bytes
font_01_sfnt_off0000e26b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 16792 bytes
font_02_sfnt_off0000fa7d.bin
df2a9295d4accbce3d97a53eb28d5b59a1eaa4fc372185ce695a0e8e36701fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16348 bytes

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