Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c691fbbf8a938ad…

MALICIOUS

PDF

77.7 KB Created: 2021-07-17 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d926f577a1b05d5f2956dd7daf89d4c3 SHA-1: 3684d3a960a50c70c89b723cd8ee312e6bb8646b SHA-256: 4c691fbbf8a938ad3cbe678c7f49fb54b3e7e8b6ed474b2c43329226f69c17ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The embedded URLs, though some are marked benign, suggest an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the PDF structure and heuristic firings point towards a malicious document designed to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/gPkW7oTCsL0/square?utm_term=the+book+of+lists+david+wallechinsky+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed485c66c2900cf55f439e/1626163292465/48860192197.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee06e2a4137771ba065184/1626212066139/roasted_broccoli_in_air_fryer.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f09278dff931167658516a/1626378872643/the_steps_of_writing_a_review_of_related_literature.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f27df5a9adb728039e25e2/1626504693906/implementing_access_control.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_off0000cadf.bin
60ea6a292bae7a63f73e2c638d125505bfd5c338eaaad37831a4c43a9c03edb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 11076 bytes
font_01_sfnt_off0000e48f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
font_02_sfnt_off0000fca1.bin
1039598cc102542da3f844112e8573599fc9fe071a50f8a061ed0d00936b1d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16996 bytes

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