Malicious PDF — malware analysis report

Static analysis result for SHA-256 10545bae962e2ac8…

MALICIOUS

PDF

81.7 KB Created: 2021-04-18 04:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6baa3b12c2098d4d3caeba9700b1226 SHA-1: 2edbb16b8288c85b446574309eb275883cab73b4 SHA-256: 10545bae962e2ac88b6a485909fe9c4e7ae952b9ae9debe511290d8368840eef
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=how+to+reset+roomba+890', is directly associated with the document's apparent content and is flagged as unknown reputation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+reset+roomba+890
    • http://uscovidcharts.com/66199967464ej633.pdf
    • http://bcpreactiva-enlinea.com/xigijevipilodejewed0c0ku.pdf
    • http://trokot-online.xyz/xidolegixec9ywn.pdf
    • http://debopuforu.22web.org/nuwujodavokidemifi.pdf
    • http://nelitip.22web.org/lubesanerewibusujadave.pdf
    • http://wokelegekak.66ghz.com/75869896435.pdf
    • http://lamovingcompany.com/81476666690k5xed.pdf
    • http://arboozfilm.com/38016898985bizg8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48f419e4-b2cc-493d-92c5-6e7b7a116d9c/zisorajotonolufu.pdf
    • https://uploads.strikinglycdn.com/files/8c32f416-3dca-4252-baf5-7b14ed0ffb1d/millionaire_next_door_free_download.pdf
    • https://uploads.strikinglycdn.com/files/d05513ff-4795-48cc-9ae1-63a5273632ac/first_bus_essex_timetable_changes.pdf
    • https://uploads.strikinglycdn.com/files/8e898e7f-0249-4a6b-a79b-f2d7ee7b7ff9/its_kind_of_a_funny_story_trailer.pdf
    • https://uploads.strikinglycdn.com/files/5e65f5a7-f692-4bbe-8927-70b1473a3eb3/mijik.pdf
    • https://uploads.strikinglycdn.com/files/cd27633d-d59e-46d4-b2b3-88fe5c7ac5a2/17910804142.pdf
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_2df961c42a1b42d39f3fc6fccc6417ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21e3882a-db64-4d1c-bee5-bc091ce18aec/50258483915.pdf
    • https://uploads.strikinglycdn.com/files/116309ae-2711-4557-9d10-14e120fc1c29/17851584229.pdf
    • https://uploads.strikinglycdn.com/files/22fc0e0d-d557-4c45-9d29-4a1f22c58bc3/runagejumim.pdf
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_5517b2d62918466f9994510f9907ccc2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/084b61a2-f2ca-4758-bb2a-61daed01af0c/59241979334.pdf
    • https://uploads.strikinglycdn.com/files/ab660da3-7417-4d7f-8f1b-65a8664712e2/viking_oven_repair_manual.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_off000102be.bin
5b0ede8e53ddbb7deaa721fba2401bf4dc6c3c7e27321feb144e80e2752295b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 5484 bytes
font_01_sfnt_off00011550.bin
42f90e8fe31d10942807af9086c0a1c4a6e7ee64c1ef23ffd5a68244bbb66ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 10668 bytes

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