Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1160281f3058c6…

MALICIOUS

PDF

80.7 KB Created: 2021-07-16 02:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7665c7df0482839dc3b30a74104b71b9 SHA-1: c18ecadf6fed9b2cae6d66a24509bd4902d126b4 SHA-256: ca1160281f3058c6b13e0f306da9c1b360ff1b27a1433a0c520e22aae815061e
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URIs suggests an attempt to redirect the user to external, potentially malicious, content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall detection profile points to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/CcIy6vlvkUk/square?utm_term=circumference+of+a+right+circular+cylinder+formula
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f05d652cd55711ca6b932c/1626365285944/clinical_manifestations_of_rickets.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8f95f83a7f26ecd1832b/1626115989987/kingdom_in_chaos_mod_apk_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edc14bd6ef6771c1d8c3c2/1626194251765/localite_meaning_in_kannada.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e877201b378f258c643151/1625847584799/26314043200.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_off0000d575.bin
437f81abb4893b4739d90d7177418ef6b0dcadb5a50ee91bb22e1823ee63f28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 17944 bytes
font_01_sfnt_off00010565.bin
966fb4642307b5898fccfa6174bbe2fd0bf6760f28f05ab26d340aa9e0dbecf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 11000 bytes
font_02_sfnt_off00011e95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 16792 bytes

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