Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea42570f92118f9…

MALICIOUS

PDF

82.5 KB Created: 2021-07-16 01:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5309729ae91a2f0819b436df343291d5 SHA-1: 6b93c3fadff0c6575d6adf2b1335f8d5837d8a39 SHA-256: 4ea42570f92118f9141a0728fdcc71ac43382c5afef68099d8b1166d2080b90c
104 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a visual download button and embedded external URLs suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted from this sample, limiting further analysis of its execution behavior.

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/gOBB6uaVNRA/square?utm_term=ctet+question+paper+with+answer+key+2015
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7f7e5dbc52028c840a7fc/1625815013380/49969164190.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f07b8b6a22b22fd8a54632/1626373003675/54888761461.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edea032799685454fa5062/1626204675749/tevutozegumevomus.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a4c9f72ea74679d3f37c/1626383561696/what_is_sds_document.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc4ad82b49873592714e6/1626195117551/what_is_the_use_button_on_a_keyboard.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_off0000def6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16792 bytes
font_01_sfnt_off0000f70d.bin
c8c410c71d09fc2b62f3833ddaf31529ad8ffac0ab0cf7df0119ddd6c4f3fbb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 11300 bytes
font_02_sfnt_off000111c7.bin
406ed3bef4f347beed60291e61107cb343b9bb715f80020178c45b0e86edbfd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16920 bytes

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