Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cb9cb9488e921a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 00:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29888579661f47fb0a6858dba22e13ec SHA-1: a3a468b8c825b5ebdbc677eae30eec791dc208f6 SHA-256: f6cb9cb9488e921a6cd726d6270a694ff4fa89bc1954c42f4202e42cdebf7cca
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely aiming to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=social+followers+apk PDF link annotation
    • http://haohanlegend.com/Uploadfiles/files/zimizupi.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/50671402671.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/zozuborob.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/lujokujurirobiw.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/14428957654.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/1250143919.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/wovamuguzibeba.pdfIn PDF document text
    • http://geodez.com/pliki/file/54289941221.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/bizosotejiteduwaliweris.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/98361874400.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/89917541950.pdfIn PDF document text
    • https://kopari.hu/files/file/risodunitosup.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/13003569823.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/zujotanatenesunixivu.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/zaxojulinoz.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wowizazenefokud.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/68372629825.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tefina.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd47ca7b4---46280728209.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/70001689533.pdfIn PDF document text
    • http://reylab.com/userfiles/file/70915752022.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0a4e77563401b734e4a5bf8756dd32df/tutaganilatujiwo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/96788105166.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xisatufidipedu.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_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 17832 bytes
SHA-256: 6aefcc5a34621adbf5aff1b475f17e582f600c3b5e27b39f7408eaaf1f9199c6
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 10524 bytes
SHA-256: b3dc4814c2a63eba29d6477517b9cf2f214cf35dce506ce594c4fa7bda02f13f