Malicious PDF — malware analysis report

Static analysis result for SHA-256 d696864b1a3b4f9e…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 09:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efbdb794162e47c47f26ad423f40b74d SHA-1: 457ea3221c5dfe74aaf7558e1efba9ffd0fa7be8 SHA-256: d696864b1a3b4f9e95b01f5199217b721a8373b7153efa249804a5d9cff4f659
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary suspicious URL identified is 'https://resalured.ru/wix?keyword=similar+figures+and+scale+drawings+worksheet+answers', which is likely used to distribute a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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/wix?keyword=similar+figures+and+scale+drawings+worksheet+answers
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/lazuta_nusuloludos_vesomeniwige.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/liziso_rotomurilaremem.pdf
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/3403968.pdf
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/bufovufaki.pdf
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/3297918.pdf
    • https://savibivo.weebly.com/uploads/1/3/1/3/131381036/suzogutob_kilesigorul.pdf
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/vekupanaguliratup.pdf
    • http://roserubusigiwij.mywebcommunity.org/wrist_strengthening_exercises.pdf
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/wilejidideketexixaki.pdf
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/lulororukavenal_zovufuba_wosazujefe_zatakaka.pdf
    • http://mosebuzixat.mywebcommunity.org/tikikusotixamifavagas.pdf
    • https://xoniruzi.weebly.com/uploads/1/3/4/8/134869292/repufarogoredine.pdf
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/watetatufara.pdf
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/lisobokegogowelabuj.pdf
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/1889916.pdf
    • http://fejugutafilevin.scienceontheweb.net/what_is_the_purpose_of_contrast.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_3472dbd43e5543ceb46a00e877af7a9e.pdf?index=true
    • http://wenibeliso.atwebpages.com/nokozofafiregirosabad.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_1c8b1e1bc9384f339b9dc670a285215b.pdf?index=true
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_0ea951665a83402a8b5388312b9052c5.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_77a9b8841ebb4cf281ef4b92abd37ee6.pdf?index=true
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_05d79b4c9a24401c8f567acefe8ad7e9.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_9ba840972af04f5cb4b49dd7eb56e769.pdf?index=true
    • http://rulamiji.onlinewebshop.net/920094043.pdf
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_19007e778dd144bc8c0dd63b60775499.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f7.bin
f67bf7ba483b4ec8a38ba248b896ed24ad8f1cb6427c0f6b184516f8dbf896d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 5696 bytes
font_01_sfnt_off00010439.bin
5eb1e0f1d6041c036b836edb3596239ead4e1e51a04bb7bc038a4895343bf4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 10564 bytes

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