Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc4512d6c4f67f…

MALICIOUS

PDF

75.2 KB Created: 2021-07-16 18:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d782fbd1397c883f65d91111c0aa0d45 SHA-1: da46e6336e207f7a02f9dece5f624b424eadc085 SHA-256: efdc4512d6c4f67ff7fe27965a240069c955b4d0c44d20bc0a392baf55d8b784
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 PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/UZrB20b2Dcg/square?utm_term=central+limit+theorem+easy+explanation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee767177e2cd4113f32c4b/1626240626107/exchange_coins_for_notes_near_me.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed99e83d37cd087e6c5775/1626184168785/decolonising_the_mind.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edc5641f6a9512286d2e3c/1626195300863/8918575954.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda28303cb9e0b59796fd5/1626186371760/veenapoovu_poem_meaning_in_malayalam.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed39eca17c7f1bf001677a/1626159596297/xerowiv.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_off0000c6da.bin
6e733fafaa39558132ab53ac31f7ddd4be1af753eebbca698b04d827efe48dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 16044 bytes
font_01_sfnt_off0000efff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
font_02_sfnt_off00010816.bin
3a13bd4960cc9e62a812ca8db57193955afa7d1f90c908fbb75291a190378055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 10764 bytes

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