Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9b701a3a8d3a6…

MALICIOUS

PDF

77.9 KB Created: 2021-07-13 17:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d67f1ef80942c6314d3404d5710a7d SHA-1: f2cc12fff5b2d76d4ecedc940543d08720de5ce6 SHA-256: dbb9b701a3a8d3a6dd73bbd27a5958f85f587250c7e1b4354ef7fcee2486a6f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'crewmak.ru', which is likely part of a phishing or credential harvesting attempt. Although no scripts were directly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9204

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=rewriting+sentences+exercises+with+answers
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e95281566ded7d61ae1a92/1625903745805/pace_health_pedometer.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eda571ac23c31e62fdf5de/1626187121729/boll_weevil_on_cotton.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e774a8395393225d10b0a5/1625781416254/rogers_textbook_of_pediatric_intensive_care_free_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e77e71db9d02483c7d865f/1625783921835/todojovojejobinenan.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8f274182611181b84eab/1626181415950/don_delillo_pafko_at_the_wall.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9aed50566b3f8665c786/1626184429297/medieval_indian_historiography.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_off0000cd53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 16792 bytes
font_01_sfnt_off0000e565.bin
7963917c6f001de233d1a431072cebbedb19e21ffb21754efcc5097fe5c8e226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 17752 bytes
font_02_sfnt_off00011342.bin
b4fedbd55e13a685e583552b6dc6cf4277fa01fe3ce12122de10d23d9cea35f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10576 bytes

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