Malicious PDF — malware analysis report

Static analysis result for SHA-256 be732712c8c829c9…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 13:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 70acdb43bb4a7eb03ce91ee8acc884c2 SHA-1: bb23453edde324fe0bc43a42f327fab0d4fce607 SHA-256: be732712c8c829c985fe72f9670bc6b9501853808309aaa22111da23ca161654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=what+does+it+mean+when+you+hear+hissing+in+your+ear PDF link annotation
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/87888784223.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/wufowexigep.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/1293400408.pdfIn PDF document text
    • https://phunhai.net/upload/files/18718209735.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/45555806463.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/69074065283.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131919403919.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/xokujomoja.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/46883788645.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/51005625011.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/48197308381.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/bekenis.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kivusanidipebixunoziluwul.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/95785680583.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/bamegoda.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zekedumilalimifi.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/36080946827.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/weluf.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sejizenifumovorederewe.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/23687514233.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wulizule.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/77321015896.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce7a7a427f---37258307070.pdfIn PDF document text
    • http://pnalog.ru/images/file/61378584282.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/26131103534.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/jatovekeze.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_off0000b118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 10944 bytes
SHA-256: ced5951da81b838c5c2ddd24398433cfa608a47a868467fb17eb7d588c470ac6
font_02_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 15256 bytes
SHA-256: 78f2b09f77f051c9314a7efaa81cac9a3ec458267efd791c84195117809f34be