Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cb2f12426574f1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 01:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58acab351f2508a8bd6e06fe1a80f0cc SHA-1: 3bb6cf3f420d5f7bb5c22c32e83018ed95dc4c97 SHA-256: 64cb2f12426574f1623fa0668fd5ec52ac3688bedee42cc3cb73b4e3c64dbe8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a malicious URL, such as the observed `https://coretry.ru/uplcv?utm_term=watch+soul+online+putlocker`, which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://coretry.ru/uplcv?utm_term=watch+soul+online+putlocker PDF link annotation
    • http://mezon.jp/userfiles/file/33176245623.pdfIn PDF document text
    • http://www.bandungmesin.com/file/xiwufubesalibem.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/suxavito.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa60ef6b2---16014049729.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zowekozexetamop.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/doxovabe.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/wegavemosuvo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/rasufirosibol.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/43427213639.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/33271702307.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/78779102293.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/67391657462.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/gemox.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nexazamajamadetoj.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jipebonopatezo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66848054400.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wabatudijaza.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/83185957882.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/73575823688.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/12623701074.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/46314447694.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_0E593FCFBA88DDE7.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/95026173067.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dea668d2a86df7dbeff271addae034fb/tabufabivufopalerita.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/58587346364.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 10656 bytes
SHA-256: 23024d0cd4c747d6d31bcaa91c2125f73c62480fd1c7accad42e9b25f582df21
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1