Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48500e13b83a5cc…

MALICIOUS

PDF

76.0 KB Created: 2021-07-20 04:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31287df781138b0ec506e16d0d6faab7 SHA-1: b45531eeb719aa3326448a73520216d37f3da951 SHA-256: d48500e13b83a5cc087ff51f992ae7b0ce2684c6791d7ba6088cf7aebb5c6b00
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 a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked as benign, suggests a potential phishing or credential harvesting attempt. The file's structure and detection by multiple engines point towards it being a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/uzX87CUNjRg/square?utm_term=artificial+brooding+of+chicks
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee7094114e6b7b7de9e3a1/1626239124210/wumetefiranulajorasur.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2a258bb7e64222df0bbb3/1626514008713/52596368500.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93bd3fc46b1505828e8ba/1625897939518/tejovapix.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e948196e267257943c04eb/1625901082086/bemigut.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee89db2485902f3e779a5c/1626245595844/frying_with_tallow.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee50937d49fb55d628ae4c/1626230931771/vesokupilowexepewalewurit.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0677bd941835b1318d849/1626367868087/ple_science_questions_and_answers_2019.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_off0000c90d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16792 bytes
font_01_sfnt_off0000e124.bin
d2b41f464139d9b8076a654d9a72847b26f3c93448a186059a951c0959492abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10836 bytes
font_02_sfnt_off0000f9e1.bin
4a0316fe841e7da49ee302ad2a2c09582c7158f72f47e03ddcb7d3707974e93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 16308 bytes

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