Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c2eb4a977a3e7d…

MALICIOUS

PDF

101.8 KB Created: 2021-07-21 18:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a88f64c72ebc880933c80e471ecd989d SHA-1: 33ceb0a6df22fb1f8e4ef566c486299119f8915a SHA-256: 81c2eb4a977a3e7dd38d6dea70fe376f9833ba9f3763da1e7c6923f0273ebe79
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains multiple embedded URLs, some of which are confirmed benign, but the overall nature of the file suggests it is designed to lure users to malicious sites. No scripts were extracted, but the presence of embedded URIs and the high confidence verdict point to a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/S-4CHg4Qmwo/square?utm_term=advances+of+computational+fluid+dynamics+in+nuclear+reactor+design+and+safety+assessment
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec85fb12c1416d2f1b28f5/1626113531771/lelurowanakiso.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8ed60f7d8d50062c97d1/1626115798754/core_java_collections_interview_questions.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f6374e0e346c31115552ea/1626748750391/fenonimup.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1ca47dc43b601c4987145/1626458696097/at_first_comma.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec923151a87c5d75ad0b84/1626116657414/how_to_heal_bite_in_mouth.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7902de8c3264fe5dd690/1626110210320/997752457.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8a7614b0a8d5efe5a4438/1625859937541/botutixojagugagoxorinok.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8068462f394a1e45efb7/1626243176185/150g_butter_in_tablespoons.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d31fba333063f1780f9e/1625805600054/lapiretogowup.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9d9df53e3457ef86e468/1626185117647/mathematical_tools_for_physics_class_11_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed4c3f37bee829a287de70/1626164287733/xiputoroxuzel.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecaafeb3b63f0898f5b1c1/1626123006138/dupipunusularigugab.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f12c3afe1af12ac2c3e063/1626418234962/panowulibomefazotomo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee28dc537273346e2e1e82/1626220764967/skyrim_imperial_soldier_build.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_off00011190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
font_01_sfnt_off000129a2.bin
c88f351395b6f68f0fa4ce08b30ca89066db34e8ce4eda62f52467d3605cb40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 17844 bytes
font_02_sfnt_off000158ca.bin
cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158CA 16072 bytes
font_03_sfnt_off00016dd8.bin
8cd1461006fdc8e17ee29990535c2fc5b4081f2187aa274fb6becae00adeb361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD8 11224 bytes

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