Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90dff31f4649677…

MALICIOUS

PDF

83.0 KB Created: 2021-03-24 14:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb35ea69e66227c859f541506987650 SHA-1: d254e2bd01edccd0d0d640b09dcb2c799c3ce716 SHA-256: c90dff31f4649677903bc8bf79d36b4c6ae19fc0291f7d8039a9a54413c16f12
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Circus Circus gateway menu'. No scripts were extracted, but the presence of external URLs and the nature of the detection indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=circus+circus+gateway+menu+pdf
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/9092766.pdf
    • https://cdn-cms.f-static.net/uploads/4459792/normal_60570a0360714.pdf
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fe0a61d1dfba.pdf
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/nuguxiwasokunitu.pdf
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/8749d.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_600a909243941.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_600da30a8a913.pdf
    • https://rogapasutidubu.weebly.com/uploads/1/3/1/4/131438129/447cb9757320.pdf
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6033ad3cb1717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lajobeg.epizy.com/xusojivizumowepoxadom.pdf
    • https://uploads.strikinglycdn.com/files/63467e89-d9df-45b7-a089-7a0cc0492d0a/4-1_practice_graphing_quadratic_functions_worksheet_answers.pdf
    • http://lenixad.epizy.com/ximupivuboni.pdf
    • https://uploads.strikinglycdn.com/files/412228b4-b309-4a8f-a71a-d7320e05eb35/nuguk.pdf
    • https://uploads.strikinglycdn.com/files/eeb483cc-f2fe-4d73-a640-830b4a956752/how_much_does_the_whole_starbucks_menu_cost.pdf
    • https://uploads.strikinglycdn.com/files/256196ac-30b0-4048-812b-ca500b4ef144/46467798583.pdf
    • https://uploads.strikinglycdn.com/files/42448a39-28b3-4593-a715-4bb2a3366f2d/torixenokime.pdf
    • https://uploads.strikinglycdn.com/files/3fc92917-e15e-4f2e-a5c1-7dd53f705e30/jababi.pdf
    • https://uploads.strikinglycdn.com/files/468d4c5c-4117-44c9-8a28-e3485f8d0b28/model_870_express_tactical_6-position_stock_review.pdf
    • http://mirajiletumumi.epizy.com/az_203_vce.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_off00010457.bin
40cb5aeb43b534d07c0a4f0d976cc0435d48182bc04a350597ef0b293827ce80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 5544 bytes
font_01_sfnt_off00011733.bin
5198eedd6f610a0f69d2b4572d2569a110bfe73ac69fbf9768d8161f6e0bb8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 11116 bytes

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