Malicious PDF — malware analysis report

Static analysis result for SHA-256 509f75bdde65bf2e…

MALICIOUS

PDF

69.4 KB Created: 2021-03-25 05:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 301d9a966fe57fb974511bcc9bea33d0 SHA-1: faba9dcb114b7196f5dd8e224a3a4fa546b41c07 SHA-256: 509f75bdde65bf2eb8a97204408e43d302c6066bf5299508eaf9691c6d0f0f53
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 'https://resalured.ru/123?utm_term=chamak+chamak+dj+song', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

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://resalured.ru/123?utm_term=chamak+chamak+dj+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5fd853c33c05b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60163770d9004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_6057fc3f13e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_60111faf2ad47.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/temperament_types_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_6052560a3acdb.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/mejixixuxogefinafidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozore/orbit_sprinkler_timer_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/pdf_to_excel_converter_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47b3d29-de15-4c66-bc8d-86fdf5143bd2/jupyter_notebook_free_download_for_windows_8.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8213e04e-95d8-44fc-a4d2-01eec563bb52/wanoxuludazum.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/61807094263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee9575-388d-4c51-b33b-0e1bf4c1498d/2015_monthly_calendar_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/58190059920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb3b4a7-54d6-4178-b4e1-eecc59ac71af/kabirazenug.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/movigimadeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3332b3-578b-400c-b40d-1e2b21747129/cuantos_cm_cubicos_hay_en_un_metro_cubico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0eb768a-1fbd-4137-a2bc-b7d74ff3ff3f/how_to_become_an_er_np.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b734c8a6-898d-4cf1-a6ba-958d355ec3eb/lg_c9_77_refresh_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2990a7-d0c8-415e-9c18-74bdbea949cd/tamesekixutuga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 5272 bytes
SHA-256: bd41fc1a261f1989fcfa90285f31e04685cad9800bee3051b4b64731ddcec27e
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 10856 bytes
SHA-256: 39b31793061eb0ccf53fffb4f41ffab20d761c2a76a82363b8498d489fd462b7

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