Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abae839de07ba09…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 20:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e8c6c11e5cbac58af999cf88b98208a SHA-1: 49fe5a9cc89ac4ac529825b1bcef4aa54c507ed9 SHA-256: 7abae839de07ba09bbe79731bf9e8205802e39f5cb686ec901626f1e48f9508d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+do+i+transfer+android+to+android PDF link annotation
    • http://chizclean.ru/files/fck/file/16870117013.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1bp1tckf1j5olb8kpotdhhmo7/muloj.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/bekowaxozilenemasoronat.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/murezubepax.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/melutejumudedirumoder.pdfIn PDF document text
    • http://aven.su/userfiles/file/37674212682.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/kezerujemujofen.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lifobodakuzujeguboz.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/lotep.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/digovupowofusevo.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/60667892222.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1079f116---pafevagebix.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/vozereluba.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/lofemaziwujebepuwin.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/81080811898.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/60882867337.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/viwebekidokejopogebudapig.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/vexutinipewulesulogoxuzub.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/73293466147.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/betaloputuwif.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/83707403123.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/fimanukesedo.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/pipekodegawagov.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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10380 bytes
SHA-256: 010c94a2751ce5b37c6329649c93cc06f760bd091d7fa2ceb4ac61053aed8f3b
font_01_sfnt_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 15188 bytes
SHA-256: 9461e83f4192036be2fbd5d56a9b3bc4ff6868611f82ed1136943196aec4770e
font_02_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1