Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a3ba874da78b21…

MALICIOUS

PDF

80.4 KB Created: 2021-07-14 04:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74e7ba4d76cb9042373bbc2aac98b88a SHA-1: fade54b399cc4880a7c8f05b4d4bf7736db76564 SHA-256: c7a3ba874da78b21ac226545c6d07837e614c67d2808b908f45f8cc4009481a5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/square?utm_term=basic+research+methods+gerard+guthrie+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7b3a18ad60325f0c42f2b/1625797537215/right_handed_system.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ed6ef4fe78435a381861/1625877870969/discrete_mathematics_an_open_introduction_3rd_edition_solutions.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee1142a005482cc152e2e9/1626214722603/18318435563.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec88f4dbb514329fafb215/1626114292316/wunibetemukot.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eda15f9a9df7051d3f9889/1626186080129/kinixogatapugozikodojop.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e81e5b687a3d659a4ecd81/1625824859412/6008256857.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80da5afd06e4982ec5438/1625820581394/73244909462.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec965e9cb57f380a793fbb/1626117726502/18634822932.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edcc7fe635d716645fc312/1626197119930/multiplication_table_chart.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e94ce20cbdad4d35071d9a/1625902306253/coc_town_hall_10_hard_base.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c662.bin
a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 16084 bytes
font_01_sfnt_off0000db92.bin
07cf9190dd23865cb77d5c1fe6edd6e5db9c980ab2b6a1c15f2c0ba213f92e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 15380 bytes
font_02_sfnt_off000102fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
font_03_sfnt_off00011b15.bin
4bdbb6ef4218ef369e641b6a3e87df0e22e178a983350b9ff4fb6d42accee03e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 11072 bytes

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