Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb45a23ab2fe202…

MALICIOUS

PDF

85.8 KB Created: 2021-07-21 23:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3c483ea64842d52753905f56327f6bd SHA-1: b2a1aab6acc7db645dc01afb79425fbc0abd00cc SHA-256: 4cb45a23ab2fe2026206bd02958c040e5c968b1f3a4efdedbe00a841abe2846f
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 identified as a phishing trojan. It contains an embedded URI pointing to 'pistant.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The document body is heavily obfuscated and unreadable, but the presence of the external URI and the malware detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/square?utm_term=design+of+steel+structures+book+pdf+for+diploma
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81f821d61f435cefaacc3/1625825154330/child_specialist_hospital_near_me.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f51dbf1d35070742344836/1626676671410/sokid.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f854dc164b135e8ff95ae5/1626887388407/16278502368.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3801b9ee5897bffa4932e/1626570779407/50195331584.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee6ef47dee9f188f7b67b2/1626238709020/60008647680.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9290327127e6804163afa/1625893123219/radiologic_science_for_technologists_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8227d5c13cc4fededaeeb/1625825917505/similarities_between_essentialism_and_perennialism.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f684da4920142c5d9d8c49/1626768602231/cost_to_hang_tape_and_texture_drywall.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f150c05422dc4ac5c78d8a/1626427585201/77220401962.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5baa6e990a14081ab87cc/1626716839980/wazojamute.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee16bb84a0477e84a87680/1626216123409/jakes_4_dogs.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f188c0906550d9090a61/1625878920199/vuvopiwarizevomadugax.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7c5ac8b0d544b6d6e8c4/1626111066746/94877458333.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e92497f229ba2ea8371acc/1625891991618/bizaporodimeretidavo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f302a4668793736d2d2621/1626538660769/21590501965.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f796d8ab09506512d5a9e4/1626838744728/plat_of_property.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f80a9c95055530dd1c1567/1626868380472/3_years_baby_hair_style.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd3cc1c6c1a61d523ec02/1626198988286/87674210965.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91bcd27127e680415bf68/1625889741079/relajevusefizoru.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ede3a1d9d5ad70ebd2ed1f/1626203042011/28297118946.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecdf2902ab3a569c3c8f91/1626136362046/46644169505.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_off0000ec60.bin
441ea85cee80a6e7f3c9d286d79e58cdf6264467ea6265d8a6db98f528d9cb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 11296 bytes
font_01_sfnt_off0001068c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
font_02_sfnt_off00011e9e.bin
502a980366b11586667f1b78c47e1a08a4e6505f62ebf4f2461bae929b909769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 16316 bytes

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