Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e547a6a2bc25fe…

MALICIOUS

PDF

77.7 KB Created: 2021-07-17 21:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28ef0d3a84f44ded20c56b699c440929 SHA-1: f0c798eb79f3114e13cb416e9a6b3a37a45f8f7a SHA-256: d4e547a6a2bc25fe85e0225be67a01212e16e12b9611a0bc3179f6d961ba3a5d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/um1bUVUAM38/square?utm_term=cooking+red+cabbage+with+apple
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edb27b50566b3f8667f4b8/1626190459629/calculate_the_number_of_mole.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec886ae94d7a30e055b7f4/1626114154426/bible_quotes_for_good_morning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec85f3e64ce537163507b9/1626113524068/46830871852.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed968de0c6fb60661343eb/1626183309581/probability_calculator_with_steps.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_off0000cc6b.bin
27431bb4b7f576daeda6353ec29d57591d5bdcc4cd5610f1cddb6e6538e369fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 10972 bytes
font_01_sfnt_off0000e57b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
font_02_sfnt_off0000fd8d.bin
943a48b952ab52cf010e467b62a614958159f1d38cd3c604d83bc940b2b370df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 16904 bytes

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