Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9e9414faf5e5e…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 11:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46edaae717e26783b4d19407bb83285d SHA-1: 8d790d1391e5c19638aa33578a33627b78092d2e SHA-256: f5b9e9414faf5e5e974b760978041aaf5c2557cf617b0d0fd06b2a1f28f746f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains embedded URLs, one of which is a Google feedproxy URL that leads to a page with potentially malicious content. The PDF structure also shows signs of manipulation with duplicate object bodies. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest an attempt to redirect the user to a malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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/sq/ugae/~3/jEScUJLm1bs/square?utm_term=girls+have+sex+with+girls
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8452e74ba94069847af43/1625834798792/rujageriwob.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edad2203cb9e0b597a8c96/1626189090256/hid_compliant_touch_screen_driver_missing_windows_10.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efdaed1b42e761db86d84c/1626331885487/12591628845.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eddcea537dfa2004045d5a/1626201322232/57066806654.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eff0f55d627c4551e1b0e0/1626337525027/tiwilavog.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efd2661e1a563dfb8c043e/1626329702489/wegitovege.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb3987daf0c15b06b6e68/1626190744381/cells_of_the_immune_system.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed883c4616123fc5fc61be/1626179644657/72228642317.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed945f8525735ba0d0d1c4/1626182751257/lomotif_apk_download_android.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_off0000d570.bin
2561b82a251b5a31d897fe79432746a0796a747611520c8d19b7043bd2573d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 10456 bytes
font_01_sfnt_off0000ed66.bin
10e6366fd0892d3aea6ddd54f739252f1c37307f150415cc82581b59965b26f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 16452 bytes
font_02_sfnt_off00011809.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 16792 bytes