Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce241d31b0504d…

MALICIOUS

PDF

76.1 KB Created: 2021-07-13 16:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5998afda259795e2d50a80691d499eae SHA-1: 04542e7786730ee1e6d50e46bf6292014e907347 SHA-256: 50ce241d31b0504db27ffb1012ba733ba14ec6dbdd4c8f2de8fb90a586714cdf
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 PDF structure itself contains duplicate objects, which can be used to obfuscate malicious content. The primary attack vector is likely spearphishing, with the PDF acting as an attachment to lure the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/AG-UZpNbJGc/square?utm_term=adverbs+of+present+continuous+tense
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed943a0999c45203717716/1626182714442/when_does_poliwhirl_evolve_in_pokemon_quest.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed95c3cd5f69124b4071a8/1626183107294/genonovudifosolanelasevuz.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7b668efb14d11220f480d/1625798248762/69653601808.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7ab69e8ef4d41b4f813db/1625795433213/zasufubabolumuzo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed94ae7c55557fb27c78fa/1626182831054/acting_for_adults.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e78383a4cbf0492a36c715/1625785219466/oncogene_is_responsible_for_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e815c64261ba7980635fa5/1625822662623/70658625635.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_off0000c89c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
font_01_sfnt_off0000e0ae.bin
f584c59510a0cb05bceafca4d19564d7abd928ebf2748f85511e09296f5ffd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16244 bytes
font_02_sfnt_off00010a2e.bin
53a75e72a1d40b0d32a40c309ad7c070917c4c2916533b2e7e31a6c53a4b0e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 10692 bytes

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