Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7910b4c8bd05eef…

MALICIOUS

PDF

83.8 KB Created: 2021-07-14 07:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbea9162744e76ddb297675c37c950b1 SHA-1: f0f8e0d2185ca97e0f17c04212b2ef4edc8f0a68 SHA-256: b7910b4c8bd05eef7587387bbbb1ca226984d6563b9c204eccd938be9bc112c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL that is flagged as suspicious by heuristics and a machine learning classifier. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the ML/heuristic detections suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/~3/1LSSs5qy-i4/square?utm_term=spectroscopic+techniques+and+applications+engineering+chemistry+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9b62fe64123bb483208e/1626184546307/fepiki.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e798fb97884458c99dc0fe/1625790715749/4017318868.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edfccec450ee4730826a80/1626209486412/95588032535.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_off0000e20d.bin
a2611b019a4e0974f3df80b4ae99b58a25b41f0f455f6326b3d392125ba6922f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 17416 bytes
font_01_sfnt_off0001100d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 16792 bytes
font_02_sfnt_off00012824.bin
d0d37cff3a60e185ced2ae3b5fd957270b1a6a812e60c19c0e8ee5a7bb6cc2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11504 bytes

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