Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d01055ee5e5b681…

MALICIOUS

PDF

77.8 KB Created: 2021-07-15 22:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a01fe830b55b7bc35ce949248ce6297 SHA-1: 3eb1c725550c46537e0b9be28a7468c4e06787a0 SHA-256: 8d01055ee5e5b6814ba9493c791a67bba2e0f9c3fa6e5613afe7684d635a8a0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded URLs, though many are marked benign, suggests an attempt to lure the user to external resources. The PDF structure itself is suspicious due to duplicate object bodies, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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://feedproxy.google.com/~r/sq/ugae/~3/EjZ5HCEZs_A/square?utm_term=dairy+wastewater+treatment+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e82f5285664d35b0eaf100/1625829202192/long_haired_siamese_cat_for_sale.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8df8c81c37306b2f6438/1626115576726/zejejukumegonege.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec80f9c3fb560d26f2a3e7/1626112249832/54417108687.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efdbb30dea5e4896bb9e42/1626332083818/seratodigolaresoxona.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e924d9b68d8f0f4bf864ae/1625892057853/church_and_rothko_sublime.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_off0000d04e.bin
363a1af659826c851f089875312182d8d5496c3ef60aaf6040a415f847fa5c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 10696 bytes
font_01_sfnt_off0000e8e9.bin
455bf22df0688bea65bc631ecf0892d3192bca3ddd32e7e9da8fc3e67846406b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16368 bytes
font_02_sfnt_off00011348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes

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