Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8fcdc5b2f05b2c…

MALICIOUS

PDF

73.6 KB Created: 2021-07-14 00:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7407ca18dbd948f864369e54d1dd64a3 SHA-1: e1c0fb01d1cbe3b49c4a11052d85fe01cf1a06f9 SHA-256: 5e8fcdc5b2f05b2c0f131d56aeaddddf7f8f9bcfdf7b047668f7fb799a80d771
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user or download further malicious content. The PDF structure itself appears to be malformed with duplicate objects, which could be indicative of an exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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/iCUEKX862tE/square?utm_term=biology+gk+questions
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0056ba7c7f743c20d5b2/1626210391035/pitbull_dog_fighting_pictures.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8857c217102653d6af41/1626114135553/example_of_project_report.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8468c3fb560d26f2f9d0/1626113128556/how_to_get_easy_anti_cheat_for_fortnite.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_off0000c046.bin
912bb9ae492debb0a05e895598f5c572495aef87bd7da1fac3852be1b583143a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 10524 bytes
font_01_sfnt_off0000d818.bin
dd174eaf12df645013bb59bb9ada011df6a013f1de71e6573e21baeff017e8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16476 bytes
font_02_sfnt_off000102dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 16792 bytes

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