Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87fa107149daae3…

MALICIOUS

PDF

79.4 KB Created: 2021-07-12 21:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e934347c2a4a2fc4a943e046d18182 SHA-1: 8651d99a0522b574f38f894422705911ecee511b SHA-256: e87fa107149daae3b0f9e516bd71803f323c0113d2a50d09071547137bcf789b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'crewmak.ru', which is likely a phishing lure disguised as a document download. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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://crewmak.ru/square?utm_term=positive+and+negative+sentences+exercises+with+answers+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec82c5ff9c8b53cea25440/1626112709721/26682827589.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d6630cb99a3e7b658f7b/1625871971483/dowifazozoserenalerato.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9090919a9f87deb71da3a/1625884937318/36322792876.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82393ce8457037ee55c99/1625826195669/gta_5_file_for_ppsspp_download_android.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_off0000d360.bin
40742596676e2edd553fa23b58fa21569287857d6a0c1bd527744d6b6d46d0c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 11108 bytes
font_01_sfnt_off0000ed27.bin
a270fc081cdaa72a083196fea48c9e4ac6f881b52debadaf323dac40f36d3732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16880 bytes
font_02_sfnt_off0001194c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes

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