Malicious PDF — malware analysis report

Static analysis result for SHA-256 510a3a4ed96e7f72…

MALICIOUS

PDF

135.1 KB Created: 2021-07-16 09:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a3b5d46c13df27246cb5c0189e8ebea SHA-1: bcb1d3bfbd6ebb652de3b85c0444b2e5779e537a SHA-256: 510a3a4ed96e7f72fa1ccf03a2650bd10441ca4aebd844d631fc19c15cb5ab93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also indicated a high probability of maliciousness. While no scripts were extracted, the presence of an embedded URI pointing to a Google feedproxy URL suggests an attempt to redirect the user to a malicious site. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall indicators point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/CHqDoFjlE84/square?utm_term=american+heart+association+bls+test+answers+2016
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0d663133357608f3802cd/1626396260120/sosadu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e93facaa30721e65f0151b/1625898924419/a_neural_algorithm_of_artistic_style.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8426e85181504630b87df/1625834094977/69793259862.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee69dc1f51426150cfc489/1626237404150/service_tool_v3400_free_download_mp_237.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7ad1ca3609a707ba9a7ed/1625795868555/act_geometry_review_problems_answer_key.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ca08351081123f7c2c6e/1625868808300/kovanadabikal.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0b2734be5f74a98d95191/1626387059581/sermon_about_peace_of_mind.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede6fed6ef6771c1dcf7c2/1626203902808/the_queen_from_england.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f00fdb90ddb31b72a892cd/1626345435172/zezelazeze.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f08909f3fa2c777743b1ed/1626376457630/proportional_relationship_on_graph.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_off0001ac62.bin
c4aa8cc03d6c5ad187be6ded79fb55f0573faae0d7336b80dd4621d844327c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC62 18260 bytes
font_01_sfnt_off0001db9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9B 16792 bytes
font_02_sfnt_off0001f3b2.bin
a209b57ca0bbf10cd7195ca9d2e5ccfbceb47c94d8dbb2bf932d625483188d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3B2 11164 bytes