Malicious PDF — malware analysis report

Static analysis result for SHA-256 541c16429a36a50b…

MALICIOUS

PDF

82.1 KB Created: 2021-07-17 10:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 228a1465e3bdd1544ef1010dd8e755a7 SHA-1: 7d13e72130a4da43fce2b28076032c470e0d43cb SHA-256: 541c16429a36a50b9d558264716b8c70707c8d87e36a72c8d0ebab90c6784d05
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating it is likely a phishing or trojan PDF. The presence of external URIs and a 'download button' heuristic suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure and detection indicate a malicious intent to exploit the user's trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/ZFaGRQ6RLlg/square?utm_term=english+class+10+sample+paper+2020+21+with+solutions
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9305c439f82871674567/1626182405435/what_is_a_letter_of_interest_vs_cover_letter.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8177ded7e63043966bb33/1625823101703/fever_and_cold_sweats.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edab905dd1eb1c29080cfa/1626188688719/18085966776.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9738b3b63f0898f3b414/1626117944918/computer_science_book_for_class_12.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed0b8ddacdbe35d625879b/1626147725388/22704419143.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_off0000dda7.bin
bcbde4fae2e66fb70a8330d98ede82b03d1295ff6701be9fde600c5ccd8bdbe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16864 bytes
font_01_sfnt_off000109cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 16792 bytes
font_02_sfnt_off000121e4.bin
99d2d943b79397fe99d10e453c32025c9531cf5235317841cdbecb6a7d294161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 11284 bytes

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