Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03b590a056f6ea9…

MALICIOUS

PDF

77.8 KB Created: 2021-07-14 00:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b6c1e70b8273151664a4c2ed0e58ad SHA-1: dc9662fe7af39ee30435fa963b55caa39215ebe3 SHA-256: b03b590a056f6ea916f68c23e0357b99deca2409efc04fdde83c283f2c993997
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even if some are confirmed benign, suggests a potential phishing or credential harvesting attempt. The file's structure and the ML classification point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=subsides+crossword+clue
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edefcbea8d40126a1de11c/1626206155731/authorization_letter_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee007be55429721e24d97b/1626210427605/chapter_1_introduction_to_the_human_body_answer_key.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edff33a9aa746350cf85a6/1626210100222/good_for_naught.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed8dbd4bcdcf6393ffb53b/1626181053806/how_do_you_find_slimes_in_minecraft.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_off0000d145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16792 bytes
font_01_sfnt_off0000e957.bin
cd7e636730a33fe01a79dbd6084411809ef893766c4c9322f3da0b3f99c24521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16380 bytes
font_02_sfnt_off000113e2.bin
b021579ed673b1b3916bc5ac110c6e38e3a350f1e7e48541e731aa84697550fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10400 bytes

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