Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cc42ad7801008b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-15 13:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 157e498bc9130accb5772bc49c9d77f2 SHA-1: 6304b738d4f351e7b769c5019528ebfe4d59e838 SHA-256: a3cc42ad7801008bc686ddf66d38be2e0788104e46ae174145d4f614c72ee06e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded URLs, suggesting it is designed to lure users to malicious sites or download further payloads. The obfuscated document body and the presence of embedded URLs indicate a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=the+meaning+of+exertion
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0e297c5bce1f334922ca/1626213929236/hallucinogenic_and_poisonous_mushroom_field_guide.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e836cdadf2c268820467c8/1625831117720/porupepuxesemagexajivo.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efdb911e1a563dfb8c56f1/1626332049579/1867828805.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93585b673687559686b37/1625896325810/revised_new_oxford_modern_english_workbook_7_answers.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_off0000c544.bin
5dd030c7e37e460195f165de527820d28118ae34f6315586b9cc8ced8e169ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 17688 bytes
font_01_sfnt_off0000f3d2.bin
9282795e1d76ea4ebb3224cdb1d2ff2c8b9d7740f4ac7452dc3f38b54a50d11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 10512 bytes
font_02_sfnt_off00010b8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 16792 bytes

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