Malicious PDF — malware analysis report

Static analysis result for SHA-256 b333d84673a51b81…

MALICIOUS

PDF

79.4 KB Created: 2021-04-02 08:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3416c7d48a1232eaaf0b5f602df996c8 SHA-1: 23213ab34b0812bb757c19f2b26ad19d4c3a9aff SHA-256: b333d84673a51b81578bdb0202b7a9027bef29925fa00780b2de0858f229926c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely used for phishing or to download further malicious content. The document body is heavily obfuscated, but the presence of the embedded URI and the high risk score suggest a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=essential+clinical+anatomy+fifth+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_601f8e1c668f0.pdf
    • http://zapixexarepol.medianewsonline.com/sarefikukezesenozujod.pdf
    • http://kemutedetabu.scienceontheweb.net/96490943273.pdf
    • http://golomashvanna.xyz/make_money_app_androidk2okl.pdf
    • https://cdn-cms.f-static.net/uploads/4421205/normal_6061ae674dc25.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_60262413a139b.pdf
    • http://komozazene.getenjoyment.net/attalea_cohune.pdf
    • http://kinemulawaw.sportsontheweb.net/britax_car_seat_base_lock_off.pdf
    • http://free-at.pro/wikegaxuboz7uelr.pdf
    • http://ukrdomonis.xyz/19159464960o7l2q.pdf
    • http://sapazukuwujoji.22web.org/81129029407.pdf
    • http://tonedomopoja.scienceontheweb.net/jowagud.pdf
    • http://perevod-card2card24.site/exploring_physical_anthropology_a_laebh3n.pdf
    • https://cdn-cms.f-static.net/uploads/4485161/normal_60273f9d0ec8e.pdf
    • https://static.s123-cdn-static.com/uploads/4486199/normal_600441799df67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d59ff8e8-29d4-4b69-a6dc-14c921882f44/pumapigexodonadasivemaw.pdf
    • https://uploads.strikinglycdn.com/files/e0e633e2-de21-40f4-ad11-d817f68f756d/what_is_the_temperature_outside_right_now_in_my_location.pdf
    • http://juletonos.epizy.com/60939290717.pdf
    • https://uploads.strikinglycdn.com/files/60f346e0-73a7-4e12-85e7-fc8db4e1ff1a/mozart_c_minor_mass.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f767.bin
2036e0f4bd9ad7358354514573df4dd80549fd3b14bc5baeeed3d928f1ececae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 5360 bytes
font_01_sfnt_off0001098d.bin
1f99c74ce419c173befe392e217af3d6b00c289c15c726c29af7d5f2f4f3b469
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 11252 bytes