Malicious PDF — malware analysis report

Static analysis result for SHA-256 93be9bc69f51064a…

MALICIOUS

PDF

121.9 KB Created: 2021-06-07 00:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 83eb52e9a6c27241a241dc3a92c5e79d SHA-1: 09eb39582ff598a58a585da8ea32988524d185e6 SHA-256: 93be9bc69f51064ad3721e93520fd6df15379991519fd467db15c1f0cd6617ad
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://medvor.ru/pbw?utm_term=mccurdy+%2528family+and+kinship+in+village+india%2529+argues+that+arranged+marriages PDF link annotation
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/fc803605c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_600e480d6073c.pdfIn PDF document text
    • https://xaxomawiso.weebly.com/uploads/1/3/5/3/135329970/kikixibitogupav-wazazupusewifax-javosaxolusiloz-kesoxixabozarus.pdfIn PDF document text
    • https://wemuwenaxi.weebly.com/uploads/1/3/5/2/135298044/8570497.pdfIn PDF document text
    • https://mululugasafes.weebly.com/uploads/1/3/1/6/131636627/3029849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_602f176603487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_6069e4f3864ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6037e2222dd1a.pdfIn PDF document text
    • https://debagodijif.weebly.com/uploads/1/3/0/9/130969595/xikimeripas.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/2962552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_6060bb56d2fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_6063417e53562.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/e3a26aa.pdfIn PDF document text
    • https://radasezase.weebly.com/uploads/1/3/4/6/134643415/jitovosumexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_60050672b9788.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/1924d416bc929f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fe6fb8e8abef.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/10e4b284c4103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasiduvegulu.pbworks.com/w/file/fetch/144567807/birthday_compatibility_book.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/w/file/fetch/144715032/foxconn_motherboard_n15235_network_drivers.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144673008/lawerux.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144450654/biosynthesis_of_unsaturated_fatty_acids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29232ac-daed-47c2-9526-6e2cf64d264f/jackie_chan_adventures_season_1_ep_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c45c3d-787a-4cdd-b415-2e32903d3ce9/how_to_online_application_form.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144738273/como_descobrir_a_senha_do_wifi_pelo_celular_-_j_conectado_iphone.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_off00019eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EEF 5956 bytes
SHA-256: ec473bd1ce8ee64ec86c231481d72eb2b901c96966f60e83fa1fb4bd91dffd10
font_01_sfnt_off0001b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B33D 11132 bytes
SHA-256: ae94579fd0c73eceb05def16ceebfab6401a4b7f07a6fa6b0ef02c7e34c584c1

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