Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd30f64f86bd8ce…

MALICIOUS

PDF

80.7 KB Created: 2021-07-20 09:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bf73f755c443863f0fb18daf8697721 SHA-1: 7ad739fa4300ca24221970f75d6a8e8d7539148d SHA-256: 4bd30f64f86bd8ce9c96ba06f10539bd3abf6849c368948160bfaf0d234d044f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as 'Pdf.Phishing.Trojan'. The presence of an embedded URL, although flagged as benign in this instance, combined with the overall malicious classification, suggests a phishing or malware delivery attempt. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

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/EjZ5HCEZs_A/square?utm_term=level+3+teaching+assistant+interview+questions+and+answers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3ec3525edf1230660625b/1626598453999/xixakimubometesagilifu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec83afbdd82073f6ff1270/1626112943107/89216055529.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f40705783e880aac86999b/1626605317689/donor_and_acceptor_impurities.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f057e4fb04a932b0d12520/1626363876825/gofowagesorokeromozene.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f340b49c7c9f0ea9999d64/1626554548972/32993632321.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f55f1d29712869f07fb8df/1626693405941/64374683959.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_off0000d93a.bin
e32f818d9ae71eca25067bb032c89d408e29aea0ee123f5a807d1a8440a737cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16716 bytes
font_01_sfnt_off000104ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
font_02_sfnt_off00011cd1.bin
b376f68f6cce70b67673bd3c5447d9014cc336931831fdb2c412640ff2ca6ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 11176 bytes

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