Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa630c285b9fb042…

MALICIOUS

PDF

81.0 KB Created: 2021-07-13 16:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16a016b851bb3e8c52c140522e2cc7b SHA-1: f4220cb8edb2e769633603eff55c6839cbb63d8e SHA-256: aa630c285b9fb042c38f8c5d7ed4a0d476553ccb4e4ef30a5ac852e981cb41c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains multiple embedded URLs, one of which is associated with a known phishing detection. The 'wkhtmltopdf' authoring application suggests it may have been generated programmatically for malicious purposes. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly suggest an attempt to lure the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/iXsW93xxTQA/square?utm_term=1+hour+time
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed7b47f95b5524f953ff8a/1626176327701/lexicographically_next_greater_permutation_of_numbers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb90049e93b1e4da1c98c/1626126592356/questions_to_ask_your_best_friend_about_yourself.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9333af807f1e1526b0a2/1626116916019/laurel_hill_state_park_trail_map.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9476f37da2614570f65f5/1625900911113/average_life_expectancy_by_country.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8be5659653256e7b1a982/1625865814295/22559612420.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_off0000de15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 16792 bytes
font_01_sfnt_off0000f627.bin
89fe97997ca7a1ae8b7d947b58ed477cf6d279725cb020255c6da57b28e764f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 17200 bytes
font_02_sfnt_off000122c0.bin
45486415966ba228c6c308670164515a16bd2c4644b368c83be023d25fc3fab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 9948 bytes

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