Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c97221057c5338…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 21:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1994c52f754d64dd9dabafc93c8da851 SHA-1: 698bece67f1af96e1033ed09423e189525fd29d2 SHA-256: 07c97221057c5338c7666785efb11aec69671bdde2596b99923bafe32445774d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://cissud.com/uploads/ck_editor/files/fevelikoderatepep.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/wivelunagurifumozidu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/vujepugutoxorujamurok.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/3457779679.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/66937615584.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56166635897.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/kebomizulelarofejop.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gijenavejadifi.pdfIn PDF document text
    • https://titishop.co/upload/files/sejiw.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/19408162715.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210920063422.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/86194772550.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vapajuvajudag.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/90bce888b33ad32a3226582f74bc433e/49111702692.pdfIn PDF document text
    • https://phunhai.net/upload/files/raxulososekinixagowijofew.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/80353404091.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/madutakoze.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/58788577317.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gobaponubur.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nejov.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/lodunopek.pdfIn PDF document text
    • http://sieuthibds.net/images/files/laseb.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161406da9c21a3---49719554437.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/48470034487.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///26557032238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=finding+perimeter+of+a+sectorPDF link annotation
    • 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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 17928 bytes
SHA-256: 07d255a028086cd855853c3f32b62cb364b29ba72c3cd69ac2047828efc11a55
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10892 bytes
SHA-256: af2aeafd3dcd95d4815862a8e50f197238669c16c56b23e62210924fbe42e156