Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb8017b0256dc0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 16:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ee27143fdf7edfe3c6f1b3915317fe6 SHA-1: 7158ca6d20e2cacf604d7f81c84cd91858e569c9 SHA-256: 7fdb8017b0256dc0c6f7f42b08370eb55c8721c344470809106e8cd1ed72fa2a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains an embedded URI pointing to a URL, which is a common tactic for phishing or directing users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. No scripts were extracted, but the presence of an embedded URI is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://feedproxy.google.com/~r/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=strong+winged+birds+related+to+the+albatrosses
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecaa64f6fc466b5bf6d7c9/1626122853019/56262142967.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd8e9ff6d86145b98498c/1626134761738/bsc_computer_science_books.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed36c7094bb21e99927061/1626158791985/the_first_stone_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed0b7e094bb21e99904dc7/1626147710155/mutants_and_masterminds_3rd_edition_character_sheet_fillable.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecb5875b92cb3d5f9edf6f/1626125703358/stimulation_meaning_in_tamil.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec9ae6c81c37306b30df17/1626118886816/xiwabumixaxoximob.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed1a68094bb21e99912850/1626151528779/number_1_chinese_new_city.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8b678641ef15ae16d58cd/1625863801051/zaziwipapudejixifulavemug.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7aa5b872c4c6263c24fab/1625795163282/guyton_and_hall_3rd_south_asian_edition.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_off0000ec82.bin
3104a1bb94f1b72dbab9f6b8ef4ad9ea46f5314dd84705552ccd73d49f50423f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 10828 bytes
font_01_sfnt_off00010539.bin
94202bca0523f209132fead9462069923a44644dbe51f063b5a9ac45a8c64c12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 16684 bytes
font_02_sfnt_off0001306e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 16792 bytes