Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f98140904bd1a61…

MALICIOUS

PDF

92.2 KB Created: 2021-07-18 16:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f81125c63b45678bde944cbeec85f84 SHA-1: 5280dcc4c2e2dbb0f854f19cbf8c2b14f2392b6c SHA-256: 9f98140904bd1a610961fa412d6a2c5526bd533c7f6012d840a76af32b9d5681
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs and obfuscated content, suggesting it's designed to lure users into clicking malicious links or downloading further malware. The presence of PDF_URI and EMBEDDED_URL heuristics points to the exploitation of PDF vulnerabilities or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8712

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/EjZ5HCEZs_A/square?utm_term=earthquake+resistant+design+of+structures+lecture+notes+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec98afbcf8be39b507205f/1626118319980/i_love_lucy_bloopers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8005480504e0a776b05ae/1625817172577/homosexuality_in_humans.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3be78d68f3225905e21c8/1626586744691/michelle_williams_believe_in_me.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e78d2fadf2c26882fbc65c/1625787695120/44406275222.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e56b2f3c4128e1871cab/1625875819188/xazogiz.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f174307c30ad68c6420124/1626436656749/let_them_eat_cake_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f29d21b84a576e6cf89f0c/1626512674099/vfw_national_bylaws_and_manual_of_procedure.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_off000106f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16792 bytes
font_01_sfnt_off00011f07.bin
88ee2dcf7787aa726d4d1d95e2a123dc4fe827e5ec9c920bf2923e63249aca10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 11220 bytes
font_02_sfnt_off000138c3.bin
d234146380021aeeb83b16447753b50f95defc191908b7ffd8d6104ee4312225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 16676 bytes

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