Malicious PDF — malware analysis report

Static analysis result for SHA-256 1881844199a92141…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 16:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2198e6e054aea672762cca5ba5c09b7 SHA-1: 8309e76924e042539734bd5b22941a6f67858e2f SHA-256: 1881844199a92141aed81504f334eb5375fb11e21b59e7a79f38c69cd5993626
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used for phishing or to host malicious content. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=one+ps1+iso PDF link annotation
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/16033173961.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/desuvomegur.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/85544198219.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/desofojemirakadomamada.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/62048087344.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/19358694082.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109011728156185.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zajipuruvidanawexuguze.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e74b4687f---85214853395.pdfIn PDF document text
    • https://ntc-container.com/upload/files/91807808563.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/39405003639.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/29295424769.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/83233537220.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/xudamopejine.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/pudulibolotiga.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/49794262fec6b015cbeb937f23daa861/93780571998.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/75572771090.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/22934900311.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/47783310003.pdfIn PDF document text
    • https://podimercrm.com/img/files/70888935099.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fiwofuzixalen.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bikirefajiwuxor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 9916 bytes
SHA-256: 4a07ca0dfbc013b2f4bdb3068ecc3a524da729eadc1f9e7b4197eb0d82f1c6bc
font_02_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 17240 bytes
SHA-256: c1a74ceb45e46db65dd3520d9d935be1f9f214f8b2527ef8bc80ac73df619593

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