Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff810c90990c0182…

MALICIOUS

PDF

88.0 KB Created: 2021-10-05 13:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e564861f1013329ed041d0e3e795da91 SHA-1: 0fc75f0c207e6b338a498e58b0868781dc3db129 SHA-256: ff810c90990c0182f721e9cad4c0bbca78756247007297dabad76c4524b6f55d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=spare+some+time+meaning PDF link annotation
    • http://benthanhsgfarm.com/images/uploads/files/27024970500.pdfIn PDF document text
    • http://vecsecity.info/editor_up/pugajazemif.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/zujuxurokixisadume.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/jazivujelopoguxe.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091923523173499.pdfIn PDF document text
    • http://kite-surf.sk/files/potafunizovitoguligutok.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/64700182089.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/75902771635.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614e56d65ea36---vawemol.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/92456951905.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vabamego.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/12690761896.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/lowejijuledosunagudadag.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/rorafagepaxakusu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wilisolikefumari.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/enebivurikaf.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nelexem.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3e92e17dd755ebb49ade305523d621fb/88296823157.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nojaxuvifotuvunimo.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/14261883339.pdfIn PDF document text
    • https://tierlistei.ch/downloads/rikubu.pdfIn PDF document text
    • https://kinizsibank.inweb.hu/_user/file/45901714159.pdfIn PDF document text
    • https://businesslife.com/content/file/20651348913.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 20628 bytes
SHA-256: d04d4952d59b3b07ac681892545f8804b7d7080c0f67b88f2cb33ab99dfcb415
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10624 bytes
SHA-256: f7498431e6dc611f550ac2aa9cd4ccb36ffa76508a6f06a0660d741dc8dd2cd0
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9

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