Malicious PDF — malware analysis report

Static analysis result for SHA-256 1127e7462fa3bfd9…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 02:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 333a47fcd3fc712a69b1de945eb5d26d SHA-1: cf9153781159ed0dfd76caa0e1d1f506e8b2704f SHA-256: 1127e7462fa3bfd91d1a053de8a9a32201e19f6c0df2903df7a6f645b601ad28
154 Risk Score

Malware Insights

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

The sample is a PDF document that employs an image-only lure, typical of phishing attacks, to entice users to click and download further malicious content. It contains embedded JavaScript and numerous external URIs, indicating it's part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=advice+is+noun+or+verb PDF link annotation
    • http://bdnchem.com/upload/files/nunijowaze.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vonotowedepiri.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/nusofijobuwaputudizam.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/walemazawo.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/kajidevifarudadopikiva.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/38126246456.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/58691700954.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/litakulisefelovejujexu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/69427699455.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8540da2be---89441925635.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/63126887101.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/demorupotelikexepurekaxo.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/93750681175.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/29076682426.pdfIn PDF document text
    • http://foodchemsino.com/d/files/98306088653.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1633331173.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/35184601081.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vunewigolupemaribibut.pdfIn PDF document text
    • https://training-access.com/upload/file/39298610180.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/guxedezojux.pdfIn PDF document text
    • http://101balkon.ru/upload/files/zekutosomanutijilesobop.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/bipamarirakigulumituror.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/nuzofugeko.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/sidof.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/74780083037.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/45960898670.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5f0ab01fbc961383c4d594b512813d94/13399730573.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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 14332 bytes
SHA-256: aa2513efae0a0dbabe4bd36c2faccc93f9f7f1e3971f1b7a1ea635a6d587ba5c
font_01_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10344 bytes
SHA-256: 620b0d79a34a8ca90829921125a947b5a1a472a3653e024331f905b96032d236
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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