Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeb2589dbef5316…

MALICIOUS

PDF

77.8 KB Created: 2021-07-13 21:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fcf8702ab97fb4f8e1c77f0eeb28f4b SHA-1: 0b85deebf510d2c4de509d1b772d0ebed1697c0c SHA-256: 4aeb2589dbef5316bf96148c80524ab6a049d2a643fdd33dad51f8cfe4654ff1
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI, although flagged as benign, suggests an attempt to redirect the user. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific payload or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7939

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/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=best+free+pdf+reader+for+ipad
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82fe37e45264421fc1453/1625829347612/at_what_age_preschool_starts.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc743b0089c62dc3baa20/1626195779910/82766888370.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9cc43d37cd087e6c9361/1626184900130/moss_agate_meaning_and_uses.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_off0000ce00.bin
c19a348e9a0c8f240619750cec76a7eb0f0d193f63e008955ea626a7b789dd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 10392 bytes
font_01_sfnt_off0000e5a8.bin
75227ba99e0a1a9b003b3f51c1ebd50c6e49ae2855124b085f6e9846be3f9324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 17140 bytes
font_02_sfnt_off000111ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 16792 bytes

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