Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ae7b31164f40f…

MALICIOUS

PDF

72.6 KB Created: 2021-07-12 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 805ee0a66f5d15fa1cdf20abf694221e SHA-1: bc8be74985d6415fde95cfe50e46336f829f0424 SHA-256: c77ae7b31164f40fedd9cfe0d5dda8c1619570ab460125cc89ddabfd5c8276c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. An external URI was found embedded in the PDF metadata, pointing to a URL that, while currently marked as benign, is characteristic of phishing lures. The presence of embedded fonts and the wkhtmltopdf authoring application suggest a potentially crafted document designed to exploit PDF vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7049

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/jEScUJLm1bs/square?utm_term=our+lady+of+prompt+succor
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e85b061058ba59989153ec/1625840390960/strategic_management_audit_is_known_as.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94e402c5c2f6215ca654d/1625902656327/3_year_old_son.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80f58afd06e4982ec65bc/1625821016650/davotimujusekezaxi.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_off0000bef8.bin
898e5b39652d0d9426a3b0d10a1976abfdac6d3d7a77d1d31ea9c3c050907996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 10692 bytes
font_01_sfnt_off0000d79e.bin
7a139b31c688952ca602d4733a8c3ec8c897dde5d5e52122d1e8e6aeefef04ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 15332 bytes
font_02_sfnt_off0000fecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16792 bytes

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