Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b88af9270fb9b5f…

MALICIOUS

PDF

83.8 KB Created: 2021-07-16 08:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44e5b056cebe05f4304138a4759376e1 SHA-1: 0036a0027b4ea187ed0b8cffbdf6aa5d114b6917 SHA-256: 4b88af9270fb9b5f22bdfd3c7a300400d48f5de1db6ce24f75adcbf93f2dd5a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'medvor.ru', which is likely part of a phishing lure. No scripts were extracted, but the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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://medvor.ru/square?utm_term=metrology+questions+and+answers+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0fed7d1fa142bceae27d5/1626406615986/8130956577.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edfa5110369373fd86edf4/1626208849875/bapedulegis.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee918a64675e3b9de5b2a5/1626247563163/bamifipamiwidolano.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1111b9b6f23611955dbee/1626411291555/how_to_use_the_pro_controller_on_pc.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_off0000e115.bin
afa8c3c0edbc8902315917277d608a8417984ba35e7be00fdbca69421f6138bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 11112 bytes
font_01_sfnt_off0000fab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
font_02_sfnt_off000112c2.bin
29be7b4f8487c982a347a9fda5f938da42ee025d46b86181a6d1ee47a109b640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 17748 bytes

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