Malicious PDF — malware analysis report

Static analysis result for SHA-256 891efb5aca1478c9…

MALICIOUS

PDF

76.2 KB Created: 2021-07-17 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bf18d35f95a257007b028d191f3fe91 SHA-1: 186d5bd51e45eb6167ed8c06212d23735f6fb3c3 SHA-256: 891efb5aca1478c96065fc305a23c934aeabd58c7467701448c37d1845736b93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing trojan. It contains embedded URLs, suggesting it may be used to lure users to malicious websites. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/UZrB20b2Dcg/square?utm_term=how+to+pick+a+watermelon+sweet
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c4ac4be6b65fb4b10468/1625867436191/52346953840.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2134ac3a5203ac9a37c82/1626477386327/70469063429.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee17ab5f7927514e3a4e5c/1626216363297/82155288562.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95bebc91b61347ea54c1e/1625906155800/promissory_note_purchase_agreement.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_off0000cb61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 16792 bytes
font_01_sfnt_off0000e378.bin
ad98679b32cbcf9b3b3ebc29760a8442df77ec117917c3f4cbb1dfe0502f116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 10704 bytes
font_02_sfnt_off0000fc14.bin
1ed90f9e1d7f9c5af96453d2cd193aa3e16791a95f7b121ac25584e7430c5ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16000 bytes

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