Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21cd40a94735284…

MALICIOUS

PDF

570.0 KB Created: 2021-07-13 19:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2627d27b7dc19a5985c8598859b547e4 SHA-1: 9fcdc274a9dcd4ea3ffca9db41e72470a8379e17 SHA-256: c21cd40a94735284fd1cd8879a94f7056065ccd1effdf1133efb0a579fc55aff
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of an advance-fee scam lure. The document body is heavily obfuscated and appears to be malformed, preventing detailed analysis of its specific content. However, the heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's intent to defraud the user. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.0134

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=things+beginning+with+f
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ab0bbab062161335af73/1625795339160/what_is_monochrome_on_a_printer.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecf5a89b2242424e003052/1626142120555/codecombat_computer_science_3_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8da066c2900cf5626636/1626181024386/concise_physics_std_10_solutions.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7e555c244202458af730/1626111573967/66795015815.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_off00087ce4.bin
b0045fe636dba0adf6949b87f2cb6894f08e520fed8c2461a9b70a752f91462d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CE4 17384 bytes
font_01_sfnt_off0008aa6e.bin
2234a369ee79cf15b7cad8345ae13cf9d6a2d4b59781171ee9a9e2c26ef4cc2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA6E 10252 bytes
font_02_sfnt_off0008c178.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C178 16792 bytes

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