Malicious PDF — malware analysis report

Static analysis result for SHA-256 079ff500a36eed07…

MALICIOUS

PDF

76.1 KB Created: 2021-07-15 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63d8a24b02c432f4bdbf727e3b219e9d SHA-1: a5552cb8f76094cf845414073316326af652d58d SHA-256: 079ff500a36eed073411fcc719a9da598fb7f8500cb017d11108864ba993bcfe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file 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 a potential phishing or credential harvesting attempt. The obfuscated document body and the nature of the PDF file itself point towards it being used as a delivery mechanism, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=pertussis+is+caused+by
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec9714973f9128ac6c97e8/1626117908832/rosiragazizikova.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e4c1025aa46e30cf94eb/1625875649375/66288092636.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec829dc268f363b086a328/1626112669925/a_minute_with_maxwell.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7719a2b69c91f9b41d8b2/1625780634636/zafulo.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_off0000cacb.bin
7c4722d0f086cec084f622db9b87c8e98141f8ecc490b611ba357f5f7299dc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 16220 bytes
font_01_sfnt_off0000f4cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16792 bytes
font_02_sfnt_off00010ce3.bin
f554d61f9c0eaac0102bc0c965670c0a2c86ace03cd99570c610000963b25769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 10448 bytes

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