Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f3e01014b8eaf6…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 19:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a43517ba920410773f9da5d5fc6dc21d SHA-1: e88a1ee9e7669bc13f00a2d582b45a78fa642b06 SHA-256: e3f3e01014b8eaf65ffbee04e7f58474f91552e0cca9be2770e9e3565d115741
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure the user to external resources. The file's structure and heuristic firings point towards a phishing or trojan delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/-MXWpcYQ7kA/square?utm_term=pretty+little+liars+the+perfectionists+season
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee7e5c5f7927514e40e6a8/1626242653193/the_fives_downtown.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e625f8bf969071e95ec/1626115683044/application_of_integral_calculus.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e798df4aaab0286a870e93/1625790688533/37150138685.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f079bfdd8e8d2fca68fa49/1626372543901/how_to_write_a_journal_article_for_publication.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_off0000e7a0.bin
e1e1cc77dedaec8a8de705c6b031843a990b0af29ef839284b8e41302407becd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 10692 bytes
font_01_sfnt_off0001001c.bin
4269a3474ce801fa676759fec3aa7d2d8563353aef6ec9f4cf2331300f0f5c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 17812 bytes
font_02_sfnt_off00012d94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes

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