Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf37dc35a6919ca…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 01:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da03aa3d809f206fd8d69a12b6ec06e SHA-1: 69a1ae809d5d3d166ee7fdafcbcdc34c41fc7b5b SHA-256: 2bf37dc35a6919ca7435a1c20d0c09af4c4353d6daa189d2e3332347b798aa03
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by heuristics as a phishing lure, indicating malicious intent. The document's structure and the presence of numerous external URLs suggest it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 1 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://inwebjor.ru/uplcv?utm_term=which+country+is+biggest+country PDF link annotation
    • https://perfectsextherapy.com/public_html/userfiles/file/titadoruzov.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210918192608.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/labenodupusimibi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/482d808a7df011bf1b472c41e49b3ff6/83966185368.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140993016e34---69039743867.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/ruvetik.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/60613637135.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/powipibizinaranam.pdfIn PDF document text
    • http://allasclub.com/campannas/file/gegodutusenipi.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojaxovabitera.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/80590676194.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vazaresigazo.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/483047727.pdfIn PDF document text
    • https://2acontractor.it/images/file/navefatibululimiv.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/potutuf.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/nagekufepizo.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/mupiwomamanasisis.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/10887046916.pdfIn PDF document text
    • http://hcpcsz.com/upfolder/e/files/20210921001601.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/monuna.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/61062390037.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_4581B6A5CD97340B.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/22210152112.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/savevefoduniron.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_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 14520 bytes
SHA-256: 34f6d0e259a2313506ab9874e9d085581432d11bb3de3f31996f68cdb2ed4208
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10648 bytes
SHA-256: 0ecdeb2b36fd3aa30d00a8a9e13bf1d77d70568d847cbc8a740fa4c7cc748068