Malicious PDF — malware analysis report

Static analysis result for SHA-256 a279c38f3e1f6ac7…

MALICIOUS

PDF

76.2 KB Created: 2021-07-15 13:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 884cb0179b4e405fb897aa274dce246b SHA-1: 0b7d3bc24d61bb797f13209c4edc72c7e14a9a5f SHA-256: a279c38f3e1f6ac72d0365a9182cc981d2ec7ba8a1eb41d6660c0036d53e753a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads. The PDF structure itself, combined with the heuristic firings, points towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/W5vEtEh6t-A/square?utm_term=book+with+one+author+citation+example
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7ad634aaab0286a885bac/1625795939163/ccna_1_chapter_3_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e967182dabf27235566399/1625909016816/lipifilututowape.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec921e51a87c5d75ad0ad7/1626116638411/south_san_francisco_unified_school_district.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4fa781e3e37a185c26a/1625871611139/how_to_know_if_inpods_12s_is_fully_charged.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8fcddef1ca41d5fa0646/1626116045597/tazabubowadotefugedu.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_off0000c665.bin
ce3d76deec3aae2327d425276a8c332be2fcba8c2550c24f95dccdcdd0bc2c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 16640 bytes
font_01_sfnt_off0000f1d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16792 bytes
font_02_sfnt_off000109ee.bin
8eb5716beea9ca2f301c27b677bb55a68150aa1c8aec9dd0401c05f8ed1c921d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 10904 bytes

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