Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b369e75a076719…

MALICIOUS

PDF

103.4 KB Created: 2021-07-19 22:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15417cf13bef30d2be4a133a304c9c43 SHA-1: dfd3803b18d39dc18365b6074fe2c5696635a0d2 SHA-256: a0b369e75a076719fcdc2ba4de76f82a50e0dbda102b984a67524df09fef1274
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that, while some are confirmed benign, suggest an attempt to redirect the user. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to exploit the user's trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7979

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/W5vEtEh6t-A/square?utm_term=water+policy+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e84404e3cefa6a229123e2/1625834500691/somugujesujo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0e2b2b3a282695d2fb5cc/1626399411108/44911308352.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee14c42485902f3e703130/1626215620677/economics_and_personal_finance_test_2_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9245704a383bbedaa7b7/1626116677721/whelmed_meaning_in_tamil.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f055b738786901bd9bd80d/1626363320399/91084202868.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f014040dea5e4896bded9d/1626346500585/action_words_and_phrases_4th_standard.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e909da37da2614570d2e67/1625885146701/cesium_chloride_ionic_or_covalent.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_off0001319f.bin
f79611fc371f3080d3e71ea2c8223a68e44074dea111c562a2dbde7048492ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 17976 bytes
font_01_sfnt_off000160e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160E0 16792 bytes
font_02_sfnt_off000178f7.bin
c40c3dc13131bf1968adce78ea7dc3bf1e5d2069e39eae441023f6881fea4002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178F7 10448 bytes

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