Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aae90953c914cd…

MALICIOUS

PDF

72.0 KB Created: 2021-07-16 16:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe7e8ea7db314798796f982569b05f56 SHA-1: c78ef589eed13eb7238a4373ed12c3df15595b22 SHA-256: 25aae90953c914cdbdef80e38a8dfacabe91c8c273d95cce1e50705db3ffd7d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'allytemp.ru', which is flagged as suspicious. The PDF structure and metadata suggest it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8216

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://allytemp.ru/square?utm_term=spm+english+paper+2+answer
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7ca3f89f8e700bf6affd/1626111140153/abyssal_diving_suit.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f7022dabf27235526866/1625880322836/unsecure_online.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e77ef7627e690f0ed5a5d8/1625784056026/kotuselutaxi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec93bebc6eee4b058f94df/1626117054749/acl_ligament_tear_treatment.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f13b75b0b7347a52261c5a/1626422133321/high_school_musical_3_full_movie_free_download.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_off0000b9a3.bin
3a62cef0689ea80e13cfd462295ed68f770c9f04fc04b54cb6085df71154ff56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 16260 bytes
font_01_sfnt_off0000e3c6.bin
b86bb88333cfb6a06426e882b3b9f65ea29f319e0240cf6ebf9a6f573666c7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 10764 bytes
font_02_sfnt_off0000fc5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes

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