Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3d4e4a3070ca1f…

MALICIOUS

PDF

78.1 KB Created: 2021-07-14 09:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04a59ecad176ddc44a6f1f38cbcbe900 SHA-1: f212b7e4150c79fddf896c2ce388cc84c8fafa36 SHA-256: fc3d4e4a3070ca1f76a8c8cabaab364e9c9f14dcd709f1bb9b3c1eba7dfeb532
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URL pointing to 'irlanc.ru', which is likely used for phishing or to download a secondary payload. The PDF structure itself does not contain readable text, but the presence of the malicious URL and the high confidence detection scores indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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://irlanc.ru/square?utm_term=22+mile+to+km
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7e32dbab062161338c391/1625809709251/sample_solicitation_letter_for_donations_tagalog.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee5921b82b3047686219bf/1626233121624/vision_physiology_book.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c1571b22c82f862ccb4c/1625866583492/new_phone_battery_first_charge.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9017866be7e490f0e4d46/1625883000966/nalutiziri.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee8646a005482cc15a6d0a/1626244678838/97091659376.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8bc53080d76c7a5108df/1626115014186/sisoluwipaxozofiwojiletuj.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e1ce7d3b385c94b5de4a/1625809358946/81501338623.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee3cdda005482cc1565b1b/1626225886086/2261553783.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_off0000cf97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 16792 bytes
font_01_sfnt_off0000e7a9.bin
64ddbb22a3ba1cbdfd70cad074b3fb9b34f7e1471a3bcc9743d1217b3b76a3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 17528 bytes
font_02_sfnt_off000115af.bin
9ddfda10ebbbf2e89d3d9bd29558508fe9acfff4c2497f28cce454a0e6b2acba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 9852 bytes

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