Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc445eb75f7856d…

MALICIOUS

PDF

81.7 KB Created: 2021-07-13 23:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e1447443d277676912c4c4e40a77b5 SHA-1: e467a50996d7e89edfd59335ba35452833db73ca SHA-256: 8fc445eb75f7856d383e7f6f04eefd7bb74b4f13a31390156fee73927c882024
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5948

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/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=comment+in+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec83bf700aa07a7894f9a7/1626112959707/pitch_perfect_2_box_office.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec910a77250868136dd4fa/1626116362630/social_networking_sites_meaning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e844f9d580de0300b648df/1625834745599/gugelumunabivadexewizuvu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edf71bafeffb59e6748f55/1626208027373/36882572835.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7963b97884458c99d9b88/1625790011598/nazefevubikodigoxox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc6.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 16236 bytes
font_01_sfnt_off0000e15c.bin
4fab5ee341f0dafb3e94733c96bdb0f3044046f66b6b76e001edfcdb0814616c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16392 bytes
font_02_sfnt_off00010bb3.bin
d2139854c674892e395af0eabd73e50f8024f9332cc9af8c5466d4871f380187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10216 bytes
font_03_sfnt_off00012290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes

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