Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcba36ba4bbc77e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 14:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf354311e50a2b182b392a62e2db38e SHA-1: 93789f293a470d58fc74e55598b926d1c524a1c7 SHA-256: 0bcba36ba4bbc77e7d81b416e0bdc3fae9ceb15214f356f6fd8cd86bc212ebb2
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The PDF structure itself shows signs of manipulation, with duplicate object bodies, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=armasight+spark+core
    • http://adminhalil.com/asteroid_destroy_asteroids_and_alien_invaders_fanfictionxndv5.pdf
    • http://kefijor.mygamesonline.org/31679743805.pdf
    • http://avbox.org/soundcloud_cracked_apk_iosveo2l.pdf
    • http://lejifip.sportsontheweb.net/99635283069.pdf
    • http://creamwalls.space/history_of_indian_art_class_12_full_circle_downloadz0qni.pdf
    • http://mebets.xyz/vakuzenewexediludorovutug7bdh.pdf
    • http://alexsaf.ru/17766031160ujwzf.pdf
    • http://legendbilisim.com/driver_stampante_brother_mfc_7360n_windows_105pynq.pdf
    • http://rbqjkwklnd.xyz/the_inferno_3_episode_8o38v6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c7298dd8-a304-4c76-b0a7-248f967c069e/why_is_my_oven_not_getting_warm.pdf
    • http://zagofij.onlinewebshop.net/lugamof.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_e659c7a2c8604c1bb5a6f58d2715dcb6.pdf?index=true
    • https://5563968e-3cf5-463b-8312-7915ab8a4794.filesusr.com/ugd/cd90d1_661bd1a10d8141bebfffdab6215fdf3b.pdf?index=true
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_7dc67231a6244d96a9a9c6ec9ac593d2.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_de1d38c162a348daaa9b4127c4d51fd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c4174dd-b2c5-4bda-8394-8dea1decf385/how_to_write_a_lease_agreement_letter.pdf
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_24b25f5a85bb48b7a8c10c2f76ccdbc5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d262a08-4c00-4c04-8b54-700619eb2c8f/liwogigen.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_725c95f1d0a74b4d8752407f5ff3f638.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2e48157-7eff-4554-bb79-a411876a22aa/refisinadenozawo.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_off0000ecc5.bin
34484bfca019e804b77f3e51d688b039740d5e2b67cef85bacb01a92e5fd2074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 5368 bytes
font_01_sfnt_off0000fedb.bin
0a3bafe9f3b107440267c8fcb3c66e66a11d9719911ec86b02896c10c302cac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 11932 bytes

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