Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f3f50dc5018ef3…

MALICIOUS

PDF

77.8 KB Created: 2021-07-18 05:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89d30f31bf30a9cad746bfdfcfa4f0c1 SHA-1: e6662d6cf6ea94495ef8eedca0dfca6851c316c3 SHA-256: 09f3f50dc5018ef30c65d2a6ee5a159249e0338aec2c033856a6b0478763c933
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the presence of embedded URIs points to an external resource being leveraged for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=biology+chapter+3+study+guide
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2f6ea54c26a0cc3f720d2/1626535658671/full_body_dumbbell_workout_3_days_a_week.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f01dc5fc6647025a3859c9/1626348997737/87528582110.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e84d16f518dd358f68a23d/1625836822839/flight_from_nyc_to_miami.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e916323f195e1e4035f490/1625888306255/best_example_of_hypothesis.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f35d91cba7b71501e731d9/1626561937173/words_from_r_to_describe_a_person.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_off0000cd9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 16792 bytes
font_01_sfnt_off0000e5ac.bin
8e1d4205a36abe2dafdad3a0130a0e2dab11624a4cd567134aba6041be2ec3b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16684 bytes
font_02_sfnt_off00011155.bin
74756f387c20095fc7e5ee805f1c9796210ac03b9096eb6276d04e192efd359d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 11128 bytes

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