Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec3b19ab384e9c9…

MALICIOUS

PDF

78.3 KB Created: 2021-10-03 07:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2b33594721b3984b188843a3f666456 SHA-1: 024b42b1a40124bad3743ac11c7a921cf0445e3e SHA-256: cec3b19ab384e9c9407227f387f1f9c095ae5bea31f971e349d2e001a797db28
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 and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=250+cad+to+usd PDF link annotation
    • https://hw-power.com/uploads/ckfiles/files/6134f0ded4d79.pdfIn PDF document text
    • http://topstec.com/d/files/bodilino.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210910215519257770uj01d.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/gatovolobuwegitajuzak.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/konurilazitijigifop.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/93244085056.pdfIn PDF document text
    • http://lg-palette.com/upload/files/54662292113.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/62689362015.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/vubaponuzewosi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140b7e192---49323558868.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/22353952568.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/41474548586.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/16508602043.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210920005815_hnndrd.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/60341162296.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/18488652447.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/27373962412.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/livapokad.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/voradisivexizinov.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/20956940477.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/gazurivax.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb95ff8f8faadd3e3bda7d16b7c03cf6/66461905221.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/3117960365.pdfIn PDF document text
    • http://jinyezi.cn/upload/wikugojivixonefi.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/43359512686.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_off0000c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC325 21384 bytes
SHA-256: 8b42f771747342baa632c54927e9c4bd3e272db70b3c66fb67d05940510a73e7
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10268 bytes
SHA-256: f5645746aeff22a10c9c4a9493c21d8ce0595b7bc5d934c9c4b8dae692d91026
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1