Malicious PDF — malware analysis report

Static analysis result for SHA-256 3112c683f0ad9c77…

MALICIOUS

PDF

97.1 KB Created: 2021-04-01 10:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5ee166a13df599ed37a12f4d347eac97 SHA-1: 24626e36724e1a36315a6afc9557deeddeeeb1b6 SHA-256: 3112c683f0ad9c776c90c1e7f64ad2205d8854464b221582f5add55e49d41741
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=encyclopaedia+of+islam+vol+2+pdf PDF link annotation
    • http://xatakafigudu.getenjoyment.net/catecismo_de_westminster_para_nios.pdfIn PDF document text
    • http://doctora.club/raposarujowuzoderoighlq.pdfIn PDF document text
    • http://buytoday.cc/stand_by_me_vintage_movie_posterm39mj.pdfIn PDF document text
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/bajuvijoni.pdfIn PDF document text
    • http://mikrotikwizard.com/romance_of_the_three_kingdoms_2_pc_game_free_downloadhsd04.pdfIn PDF document text
    • http://dostafood.xyz/tepusinivamefakikuxiganok8l7fs.pdfIn PDF document text
    • http://tevfikyuce.xyz/fiche_de_conjugaisongio9o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_606251b69c175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff5fa2422a6f.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/duwasalagof.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/kaxegukin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5fe87685d4e05.pdfIn PDF document text
    • http://titoto.xyz/how_to_reset_check_engine_light_2012_nissan_pathfinderb9pme.pdfIn PDF document text
    • http://infonewsuk.site/75449045133j6if0.pdfIn PDF document text
    • http://kawlites.online/gositamogaboti8xy1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63e407c-0d1a-435e-8fad-fbe084d4bdb6/fisuwoluzozat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d9ab32-68eb-433b-9dc5-989289b97d63/gijurok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4394b892-849a-4d1c-95e3-6c80f8f97471/actiontec_mi424wr_router_default_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddfe139-5c9f-4d56-8d02-a28e30498e19/tableau_desktop_training_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a74010-e00f-4523-bdfc-e2cca266729b/fevekilevisawazowusuwuvu.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/automation_in_clinical_biochemistry_laboratory.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001489e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1489E 25284 bytes
SHA-256: c6fbd5069cf64e48d97226fe83666eb91a64040f98145852dd96db20eb158db2
font_00_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 5456 bytes
SHA-256: 1f105f19ee25618183fbe34fcf9261dbf43c923d2968dd43e8ee302ba05727cb
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 13956 bytes
SHA-256: 9cbabd7501d843200a42cbf59c3b487d8af0326ea9abad0823af1b70ef360d10

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