Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba3b600f3ed1c3f…

MALICIOUS

PDF

80.2 KB Created: 2021-07-15 18:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a0a979caff02a3d3205faa3a69fa2a0 SHA-1: 12b43813310580b4f78adfb043c40c50bf7d1a50 SHA-256: 7ba3b600f3ed1c3f17bb86a6a4e1e80d4560ca6e44ec93acd9c13819e20fa254
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although marked as benign, suggests an attempt to redirect the user. The PDF structure and heuristic firings point towards a phishing or malware delivery mechanism, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=the+absurd+existentialism
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e81134dbb92d34f5b0ce60/1625821492752/how_many_years_would_it_take_to_get_to_neptune.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60efca1ce9d3bc6103fb636f/1626327580974/india_wicket_keepers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8fc6c37cb9044755e6d11/1625881708523/cervix_lower_than_normal.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee36e62485902f3e72fca5/1626224358485/first_signs_of_a_stroke.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0005e34da7a51e3f3e633/1626341470659/10233835398.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_off0000db08.bin
a6c3e84490ecb792cda2db985c2a5a002687c56658135bbc1ddf73c7688554f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16200 bytes
font_01_sfnt_off000104e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 16792 bytes
font_02_sfnt_off00011cfa.bin
bdbfd7da45c87db74aa03703a1e89514ad195850e6887cdc890d1ea5effc197d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10696 bytes

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