Malicious PDF — malware analysis report

Static analysis result for SHA-256 4453ef1446a5ea09…

MALICIOUS

PDF

75.1 KB Created: 2020-11-13 03:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af68193f7f3fd055df131bdabe373e56 SHA-1: 750eee0bf107b0fc7224d32e0fedb7ab0d39d5ed SHA-256: 4453ef1446a5ea09dc9f4d435722f94b33d5e6b27a3a3aef9df71da3643bb672
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains text related to a "certified dental technician exam", suggesting a phishing lure. No scripts were extracted, but the presence of an external URI and the ML classification strongly indicate malicious intent.

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://trafftec.ru/strik?utm_term=certified+dental+technician+exam+stu
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5faae1b8ce9f5.pdf
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f88c04fb6280.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f9037491dfeb.pdf
    • https://cdn-cms.f-static.net/uploads/4420748/normal_5faa6ee8ec6ee.pdf
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8bb119236c7.pdf
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5fa1bfe9523a4.pdf
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f924737d8b8b.pdf
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5f9258a8a96a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3aa2a986-14af-489e-8f03-4928e92bff89/memakanomizerigikerewu.pdf
    • https://uploads.strikinglycdn.com/files/70e3889e-d1bd-4c13-adf8-304de716b95c/kodumagozewepupufakuxax.pdf
    • https://uploads.strikinglycdn.com/files/ce0e390b-e9ab-4acb-a485-49c4b4c842b0/persona_4_margaret_social_link_guide.pdf
    • https://s3.amazonaws.com/tadovu/xiwatogake.pdf
    • https://s3.amazonaws.com/jenisozazewubo/a_game_of_thrones_audiobook_narrator.pdf
    • https://s3.amazonaws.com/susopuzupure/god_and_god_alone_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/a72c18af-ac1d-47f0-adf0-3a9ad5bac6cd/read_eldest_online_free.pdf
    • https://uploads.strikinglycdn.com/files/60af203d-a341-47ae-9fb2-876388507a4d/bhajana_telugu_songs.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_off0000e990.bin
cfae98aed7fbd06b417b8ee4aa15dfbb6b0f7ad06a81cfff0a396d4111604cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 5232 bytes
font_01_sfnt_off0000fb34.bin
2ddf7c886dba624137e0904f7fe151c7ca29ba528679aeaff7e2c014e934437f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 10448 bytes