Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e35fc6a0ec6d47…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 21:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dbcb81bb8347833f9ca794de7b411955 SHA-1: 197e910fb276f9821dc0ec9a6e51e5db7211875d SHA-256: 85e35fc6a0ec6d4701af89ca204f48f242923fa6afead76314ed5a6fc018fa20
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://resalured.ru/award?keyword=clinical+cases+in+microbiology+and+infectious+diseases+pdf', suggest a phishing or malware distribution attempt by luring users to external sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/award?keyword=clinical+cases+in+microbiology+and+infectious+diseases+pdf PDF link annotation
    • http://gatorama.fun/fesimajozinujukemojirbhqka.pdfIn PDF document text
    • http://affilateapp.online/pisegudotumezanilins44.pdfIn PDF document text
    • http://50offshop.pro/nikiwilimimuxopofiwi9kvob.pdfIn PDF document text
    • http://twirlini.com/lozikamidudovug2tgrc.pdfIn PDF document text
    • http://youla-24.cc/zukotosawawifonajowuparipwhyg3.pdfIn PDF document text
    • http://pro-komp-master.website/21588926937wu0p3.pdfIn PDF document text
    • http://new-leggins.site/bazekulif4mrbs.pdfIn PDF document text
    • http://lynciguest.com/30307574771v9re5.pdfIn PDF document text
    • http://regetun.22web.org/59342945166.pdfIn PDF document text
    • http://e-devletodeme.net/monster_vision_reviews13e3g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_6db69bd3af0d4da79302f034983a17b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57343bc7-cb91-43f2-b7f5-05cacee0a6d1/how_much_is_a_catalytic_converter_for_a_2005_nissan_murano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157dc40b-fb92-4232-afd0-b2b2d4cd303e/10970827467.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_317b2f2684da432689857a1aa2d50f44.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_221ba55cf7f34b6a8caa5619f77096a6.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_fcbc7aad6e9c4eafb24f0d8ea56ac265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6240ffd-0f70-43d1-9bb5-fd6d228fe516/2005_honda_odyssey_oil_reset.pdfIn PDF document text
    • http://watuvul.epizy.com/xuluwi.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_69953b865d4a4634b82b61ada252995d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e0ae4d-09a1-4c4e-85f0-9653da23bc54/63835069520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27775f96-00d6-485a-b1a7-2ce88ea7f669/jetutafomemogifo.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/dajosamademukorewefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee66eed6-3170-4fc5-9c58-f981ad2edfb5/what_to_eat_for_a_gluten_free_diet.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/90212293345.pdfIn PDF document text
    • http://faxiwig.epizy.com/informacion_plusvalia_municipal_ayuntamiento_de_madrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb89b30-e40a-4a53-bfc0-69fcef90e79a/wabizesabekepizefi.pdfIn 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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5620 bytes
SHA-256: 1a5664ccc661d5c1163fee016768d204ee12d3e1f9174b980f2b21051df51369
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10624 bytes
SHA-256: f92497ab45841f27ecb71ebd0efb243f0f5f9d4eb8dd41895e0f7bba4f066679