Malicious PDF — malware analysis report

Static analysis result for SHA-256 9479475cf188e0fe…

MALICIOUS

PDF

82.3 KB Created: 2021-07-15 12:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 149eb4585022a12038fb6ad3528f523e SHA-1: f63f71891d61232a7471845617aa289d3e621862 SHA-256: 9479475cf188e0fef93c572a5cfb0f7d65f405fb5843880f0d6113b319feb8da
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, specifically as a phishing trojan. It contains an embedded URL that, while currently marked as benign, is presented in a context suggesting it's part of a lure related to 'nba 2k21 apk mobile android version'. The presence of PDF-specific heuristics and embedded artifacts further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9438

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/rCno-htTzZk/square?utm_term=nba+2k21+apk+mobile+android+version
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec868372e2584f24639cea/1626113667105/electrical_testing_and_commissioning_books.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed90ba37bee829a28b6454/1626181818779/tivagaporadini.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efda5a177a4e2836d1f2e5/1626331738638/babanodifike.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee3aa89b1e4d6a360d1104/1626225320594/gugegab.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e83c4fca800d6833ddff93/1625832527732/christmas_tata_picture.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edda319779423221df511e/1626200625914/anecdotal_evidence_is.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc8b14485e42169ff925a/1626196145653/dagaf.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60effa0c0511021e70b4fd68/1626339852440/15_cm_to_m.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_off0000d2f9.bin
179a94d8e170a582e8ca7e337cd6b625771495e1ffa4b78bfbb6ed4188aaacb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 28240 bytes
font_01_sfnt_off00010a52.bin
317a9f2e58fdde26d4404cb1dff424b3614242f979a16e06fa167f0788766d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10900 bytes
font_02_sfnt_off0001236f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes

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