Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f48f18d7ec4b30…

MALICIOUS

PDF

69.5 KB Created: 2021-03-14 08:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 89c62526b9cc72c5e58aee082009b2fe SHA-1: 096dc53b1ebea60cbef836b693b4b091b606bf79 SHA-256: f3f48f18d7ec4b305cec87af27565d9c8ec372d14e32aa5deb3d95361a074aef
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, which is likely used to deliver a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to IELTS listening materials to entice users to click the embedded link.

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://lozipotod.ru/123?utm_term=ielts+listening+answer+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fd9da988b45a.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/mitedeninadiv.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/10266327718.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/40710971498.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/nortel_networks_phone_codes_do_not_disturb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_6015de3c33cae.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/risisipajole/2277869942.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/tabla_conversion_mm_a_pulgadas_fraccionarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54f7b4d-7d53-4bac-93ac-fa748c3b43e0/the_best_love_story_movies_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/96900043061.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/68768763655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9fa2d4-cb59-4ba7-8e53-bc479bc1fe3e/staples_one_touch_stapler_troubleshooting.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/numexamanebodobepivuben.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/76223245438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7973a660-8dda-48bf-93b5-5d04bdaf0132/dixie_chopper_zee_2_54_for_sale.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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 5332 bytes
SHA-256: 50e7757f54dfe87f0ac865123a528e266a47374b20f7c8d88f0dad00b6d0795b
font_01_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 10124 bytes
SHA-256: bebb33afd46a99ef0e3c8ff51c3df10eb640381d8165ff728870eed5fb4329e3

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