Malicious PDF — malware analysis report

Static analysis result for SHA-256 4151fb7d95dda3d8…

MALICIOUS

PDF

88.7 KB Created: 2021-07-14 10:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ad7fed212fd43344e2dcbd0111f946e SHA-1: f2b9aea7415d8d2c36cad2f22f5c5309b72e4aea SHA-256: 4151fb7d95dda3d8283a53993c39d62b6b75c828f9a7cf4dbaf8616d07152bf1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or credential harvesting attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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=multiple+choice+questions+on+consumer+behaviour+in+economics+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee5c343753dc428c8a4bdf/1626233908848/how_to_make_a_fraction_on_keyboard.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca7181cff58014d57412f/1626122008829/nct_127_cherry_bomb_mp3_download.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee11298feeeb055d969929/1626214697862/22645175865.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76b1c92f10d555d257ffb/1625778972874/10532835079.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e844fe1adc714db6e2f9ec/1625834750725/dewajifobubexubesub.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eddf08e83f616bcf82cb4e/1626201864782/three_dimensional_analytical_geometry.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_off0000f66f.bin
c157546dfeca9ec16d09e3f52a0a223bfc3f98318402948043362c9c6e547c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 17396 bytes
font_01_sfnt_off00012440.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
font_02_sfnt_off00013c57.bin
1f66e88dea817a3e3e2225328181667c2a6c0f1f2d1a2bd159f62023fbd91f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 11332 bytes

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