Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda1a7ac6a686913…

MALICIOUS

PDF

78.9 KB Created: 2021-07-14 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40784c327c9a105970f4ef9e449aa01d SHA-1: 4479ae3fb832719646b0717c7c3b91b9d26abb6e SHA-256: bda1a7ac6a68691324c98b21f47381a040a82551782e166b75f524cd78fba336
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URI pointing to 'https://wastran.ru/square?utm_term=middle+ear+dysfunction+treatment', which is likely the primary lure. The PDF structure itself does not contain readable content, but the presence of embedded URIs and the high risk score suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8860

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://wastran.ru/square?utm_term=middle+ear+dysfunction+treatment
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8b40412788c66626ace71/1625863172671/6707440752.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e769590d39ed3b58738017/1625778521727/how_to_turn_off_fire_spread_in_minecraft_server.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee5f028e3fff2bd3c2b9a2/1626234626159/best_place_to_stay_in_lombok.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d411a7a95e0b19802502/1625871377295/chartered_management_institute.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edbd136cf9e856bc69925c/1626193171701/color_by_number_addition_1st_grade.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee588f1cf0e6777f30482f/1626232975380/the_3_second_rule.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7f52a3e9df788e6cf996/1626111826917/example_of_two_stanza_poem.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_off0000d266.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 16792 bytes
font_01_sfnt_off0000ea78.bin
baba26b82a78496eb94ecfd81e88dd32e6758730bd14e64e8cc5f923b43e7347		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16788 bytes
font_02_sfnt_off0001165c.bin
2a09cbce6f2543fa93464e1e434d96fee3a65090f16cf7edde72434172e0bc62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 10844 bytes

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