Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b206f0f47c2fa7…

MALICIOUS

PDF

74.3 KB Created: 2021-07-19 18:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 064fa537503c25f605ed226a56e477b0 SHA-1: e020557ce28946d2592848f3beaecf420df1b2cb SHA-256: a4b206f0f47c2fa734335b30b1f5130366ba65aa5f693915c570f427de2bdabb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, although some are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/ZFaGRQ6RLlg/square?utm_term=sonic+running+coloring+pages
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f43e74ac778402357415bb/1626619508793/xiduxatukej.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f438cb25edf1230662d8c2/1626618059994/27315573867.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9213cb132fa3620738884/1625891132413/73628544005.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f03fa5365a201d3c3cf6c3/1626357669922/marshes_auto_salvage.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f29bbdec5ad00cc088195f/1626512317228/niggle_meaning_in_english.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_off0000c40a.bin
31a4d485d978e2936203ad2e497c500e4af4562b243b42a7b535b7e5ef9f4217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 10624 bytes
font_01_sfnt_off0000dc67.bin
c933646c20f45dc79f2afca3233b53a368307b4163d1972f32e4ba0db13caa24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 15948 bytes
font_02_sfnt_off00010575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes

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