Malicious PDF — malware analysis report

Static analysis result for SHA-256 79de8fb197f006e1…

MALICIOUS

PDF

100.1 KB Created: 2021-07-16 15:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32574536ba34247773d817e82b9ad9c8 SHA-1: 7d3325d8c7d922234f0db9dd65038d999911e997 SHA-256: 79de8fb197f006e118ea1766780d500a95b8dc731974258732c8cc6b75cb04ba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, 'catamma.ru'. ClamAV and an ML classifier have flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9341

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://catamma.ru/square?utm_term=scraping+with+puppeteer
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8b514a8bde38c345b32a/1626114897283/simojilatibifisimuf.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7f1befdc75e32ab08822a/1625813438870/the_new_pope_torrent.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc258c6126f45c3df0a40/1626194520969/2_cm_and_50_effaced.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1526fe013e242e715d3ba/1626428015775/enabling_flash_player_in_chrome.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e49a309bd63f3d82e49c/1625875610264/level_7_brain_out.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e3dfdc37083541b59b44/1625875423264/the_expanse_series_reading_order.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed97809a9df7051d3ebe74/1626183552425/90363681235.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ece52ec927da2a63f3c093/1626137902809/r_fft_example.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_off00012686.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 16792 bytes
font_01_sfnt_off00013e9d.bin
afbe71702b955479850b47ef24623c3aa19c93d8161c45710c42305b1f661a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 10580 bytes
font_02_sfnt_off000156ca.bin
539a3d9e982182be419814a58d949e8d1a3c0bdbf3c74fa01a448e7ab1fbe812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156CA 17408 bytes

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