Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bbb01fa112df3d…

MALICIOUS

PDF

82.4 KB Created: 2021-07-14 00:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d2a21a95cbd8a47cbe8576242ec5527 SHA-1: 6012f9f0da3ba3656b167797bd88ce4f8fdb33ea SHA-256: b1bbb01fa112df3d207db08c80fa7b28fd992b14d66dd4c5544edf2c252a0cc8
96 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or download further stages. The PDF structure itself contains duplicate objects, which can sometimes be indicative of obfuscation or exploit techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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/UQ8tT55rDuk/square?utm_term=the+lion+the+witch+and+the+wardrobe+world
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8efecb630645a0ef51d3a/1625878508506/rules_of_integration_multiplication.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e929908fb24157da705cc1/1625893264995/foundations_of_earth_science_6th_edition_free.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edf8f09779423221e2ca01/1626208496937/tumugawevinelevoroxuj.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edba7dd7feee1d98d6e321/1626192510113/nulodojaj.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f29348fdc2594041b39c/1625813651994/mojibipominekiv.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee0373a9d1f62037e6e1f4/1626211187678/pa_state_game_lands_map.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee037824c32e4364b852df/1626211192278/feature_flags_chrome.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee02f57979814f85ac05d8/1626211061516/4855746996.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7d64700aa07a78943c88/1626111333120/vulelugiliduberupinisin.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_off0000e2a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16792 bytes
font_01_sfnt_off0000fab6.bin
689533894c4bdbbd5c83a0121a6f30a57cd3a8379f03f67251f1c42b40f6b5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16588 bytes
font_02_sfnt_off0001256d.bin
5932203f7990046ceee7eb12405f6abdbf837025349138b78d535798a1d120bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 10488 bytes

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