Malicious PDF — malware analysis report

Static analysis result for SHA-256 1619241fc10f56be…

MALICIOUS

PDF

72.7 KB Created: 2021-03-19 21:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e7172a9b49774489e46073ac51f2b76 SHA-1: 24141726f48ebe9152fdacab7b40174a769b02d2 SHA-256: 1619241fc10f56be26c8a07dc7c789edfffec55d3d02bdaebc712ef45731247f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=chair+conformations+axial+and+equatorial PDF link annotation
    • https://cdn.sqhk.co/woledibiroju/gihiHAx/groupon_merchant_payment_terms.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/heWriaP/ibm_websphere_application_server_tutorial.pdfIn PDF document text
    • http://francobusiness.com/28511989319rkrpt.pdfIn PDF document text
    • http://helper-badges.com/wamewewunosaninizzz3mq.pdfIn PDF document text
    • http://talkme-news.info/29173326369745kv.pdfIn PDF document text
    • http://prognoz-football.club/hopeless_land_hack_apk_2020nj6to.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/luraku.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/omron_pedometer_with_usb.pdfIn PDF document text
    • http://mawuforoximite.22web.org/77828741199.pdfIn PDF document text
    • http://dududuw.mypressonline.com/lepitoporugon.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/aditivos_alimentares_tipos_e_funes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7a2b4305fd9f4d47a73cc5d4b324821d.pdf?index=trueIn PDF document text
    • http://pugetuwozijeso.rf.gd/fatakakemexotopepilibipil.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_26cd5a5c513b48b888c8c22b55b3dfe8.pdf?index=trueIn PDF document text
    • http://mudivakerimenog.epizy.com/implosion_full_version_mod_apk_data.pdfIn PDF document text
    • http://zazupixuwup.rf.gd/excel_vba_find_row_with_value_in_column.pdfIn PDF document text
    • http://folilef.rf.gd/cyberpunk_2077_xbox_series_x_games.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_a3269d3ec1894d918eb2b67d7db9fcff.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_29454823a4f543089811a284a6b01993.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_b499350f39224f4e844c33d047d8f207.pdf?index=trueIn 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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 5360 bytes
SHA-256: 7f57c2199d6df73ab33fdb07b6ffb0346ddb7ced9e3c957af1a9950d51436295
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10924 bytes
SHA-256: a1184d442ad23fda695859c0a05df1dab103944157f0382a028c270cb133ef30

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