Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2cf6021bc5ec1f…

MALICIOUS

PDF

80.8 KB Created: 2021-07-12 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25719b88ca260ff9590597ea20a33c6 SHA-1: a262572fc84d9f04a632c02321bfbadb9dca9ca8 SHA-256: cb2cf6021bc5ec1f40b3f22e2770d9420bb8daa14aa3413981a9046c2935e346
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs within the PDF. Although the document body is heavily obfuscated and unreadable, the PDF structure and heuristic firings suggest a phishing attempt. No scripts were extracted, but the presence of embedded URLs points towards a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/nCRFBnYrBHY/square?utm_term=2+is+irrational+number
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9161f3ba7d954d545c270/1625888287924/2206232977.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e831c94b964f05b84b8cf3/1625829833752/an_equation_in_two_variables.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fdfd320dbd0de27fc530/1625882109866/raganumim.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e76cd4c16c9823cf027bd9/1625779412376/55200062319.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e58166be7e490f0ca559/1625875841825/poverty_rate_in_mexico_2020.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_off0000d80c.bin
bd270e4c9fd1e26e9e2061042c0ab52b6aaa1ebae444e1a435de51d291ab97c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10532 bytes
font_01_sfnt_off0000f00e.bin
f43874f338a3a46c11ed74b59292dca3ae045cc79c9c229cf7c8c08a022db8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 18028 bytes
font_02_sfnt_off00011fb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16792 bytes

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