Malicious PDF — malware analysis report

Static analysis result for SHA-256 818515fc8efdc93a…

MALICIOUS

PDF

80.3 KB Created: 2021-07-17 02:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78bc0625cac00127d3e701306c88f534 SHA-1: 6cff0035bb98d9e4d8e0bd8dcbdc9c2a4ef29c93 SHA-256: 818515fc8efdc93ad792963f6df9190252954232d36ae967ca10689130269901
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating malicious intent. It contains an embedded URL that, while currently flagged as benign, is part of the attack pattern. The PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into navigating to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/iXsW93xxTQA/square?utm_term=tv+series+hudson+and+rex
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f02786161c0660543a015a/1626351495072/600_mcm_to_mm2.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8f7fc32416487af06c1e/1626115968042/33650259557.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e870a45b24ce19dc58a29e/1625845924934/system_simulation_with_digital_computer_by_narsingh_deo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f145fc5554232196bdd723/1626424828661/20673354027.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f12a946e3a8560b3d2c3ac/1626417812334/kudanamobefumumir.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1fc124ccaf47db64e9e4e/1626471442674/9933146222.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1e8bf6cc3a66bf95c5d09/1626466495988/71205804330.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec88fe8300fd66e196dfc0/1626114302888/15990448672.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee88bb2ee8b51fd939682f/1626245307449/humanism_of_the_other.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee7b5b7426fb5109f843ba/1626241883649/55kgs_in_pounds.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_off0000d96e.bin
12fbd3762563f480ec882cd7e8838368adf27ece57d598d8c4015c8060d8df40
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 16796 bytes
font_01_sfnt_off0001056e.bin
a049308283816145ec4cc24c80886542e67b8d1e9a707e56fc7d15c8dcbef937
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 10432 bytes
font_02_sfnt_off00011d0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16792 bytes