Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9fd3c84fa2fa80…

MALICIOUS

PDF

75.9 KB Created: 2021-07-15 18:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d3e1c0f2da47dc54e1ced3dd70c0c5 SHA-1: c23a478a3dcd31e9bce21b586e3aecf44c6ce6d0 SHA-256: 8c9fd3c84fa2fa80ca0916b7da59478180be9455b2bdc9cd5ec5a0b2f9a9482c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI. Although the document body is heavily obfuscated and unreadable, the PDF_URI heuristic points to a suspicious URL. The presence of embedded URLs and the overall detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/sq/ugae/~3/k6oGaauGqGM/square?utm_term=getting+court+martialed
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efdbaea26b2b69a35bb54c/1626332079002/82885563734.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e76e90097fcc178716ee45/1625779856438/how_to_pull_up_secret_conversations_on_messenger.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8495947cc46ca128af12/1626113174116/super_smash_bros_rom_android.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e922afb68d8f0f4bf851e8/1625891503491/sodabur.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_off0000c9cd.bin
06a2692fb22eb26b4bdcafb77930670c1b6d9a3219c63f0d77aa9ddad0eb44bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16128 bytes
font_01_sfnt_off0000f37d.bin
539021b44f6fb58396eafb7c3ff66f3e38020e1dbf37c471e33533c8e0e902b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 10684 bytes
font_02_sfnt_off00010bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes

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