Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fe9b546c692b74…

MALICIOUS

PDF

82.3 KB Created: 2021-07-21 12:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c1d7ee4b8fd6dbb8360c728f29e8f93 SHA-1: de30cf38e1170eaba6a90cd7f625031a3848b78a SHA-256: f3fe9b546c692b745beb3b2767ca84fd4326c4b6894285aa99853554241e997c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'infrive.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL is a strong indicator of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://infrive.ru/square?utm_term=by+water+district
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f55383e13ee976661f7527/1626690436038/psalm_to_get_rid_of_someone.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eda8f9834e745de9d1ad81/1626188025578/today_ielts_exam_answers_academic_2020.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1b659e21c0a233d8ae570/1626453594063/the_light_we_lost.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec99cb7b14134336dea065/1626118603324/91504323996.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f4daf59c57c249394d6bdb/1626659573349/kawowikefadekokulezap.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee8ecd2ee8b51fd939a24a/1626246861700/pidujovawezetit.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda4338525735ba0d22a41/1626186804258/gubufolidominuwuk.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f368f0c4d0d61e67398ebb/1626564848223/3456328249.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_off0000e2fa.bin
cc6e33f002f06c0c60cf292a2663c1df02fda9e9e2e6a3456daf57e99227ca1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16516 bytes
font_01_sfnt_off00010df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
font_02_sfnt_off00012608.bin
2b0983b471772ccfc35e81d79c6061942cbeabf15ce8c03d9aa8b799f86a15ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10344 bytes

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