Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee73600809ee5d2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 13:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b69a45e9b2a105ff91818f17f1ecd4 SHA-1: f4e3422fac8788a8ee561094e2d97fbf8d8a8731 SHA-256: 1ee73600809ee5d271ebcb9be8b9221b62f59185146528257a0a070f45eb088b
156 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=skyblock+server+ip+and+name
    • https://cdn-cms.f-static.net/uploads/4392218/normal_600c59d2eb157.pdf
    • https://cdn-cms.f-static.net/uploads/4416131/normal_603b7b2d1aa00.pdf
    • http://alcexpress3.xyz/solexabonekixodxh43j.pdf
    • http://avit0.cc/lucky_for_life_numbers_may_20_2019xbhqs.pdf
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/750c81.pdf
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/cab14.pdf
    • http://biomanua.website/40244360794f6a4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_ef0cef6fa8d241d8b57553ae4b18d2f3.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_fa56ffb75506427fb1e5dfe46f6ce9af.pdf?index=true
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_4d36bbcc89254d00b09e5ed8840f7617.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_b5d8106ff34645e9b7dd2b03caaaf2da.pdf?index=true
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_7f47e003bf9349449577fbc816288a89.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_0143639046724517b9906b3625a9b1e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3527780-875a-44fa-b0f0-ade990bdd1e5/87578346954.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_11c1f55acca640f28d28513e41a63244.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b01f65cf-6629-45c7-aa59-1d827e4dfa78/why_is_my_oven_not_getting_gas.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_70497a29104341d8a5b16f909e5cd663.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e465.bin
f5b8d796feced9aa3922e9ad1096d77d59978575647ea41592f22a13c9c4bc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5688 bytes
font_01_sfnt_off0000f7b1.bin
b39c510dbcd99832ff76e30d99a79e9f6702e38628abfa0a093b4c563cf5cbf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 9036 bytes
font_02_sfnt_off000109fe.bin
f6efaecd21c6ad765295465a053d9b5783d0b7a52449973c76b234ddbe696550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10952 bytes

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