Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663a619e661eb47…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 01:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc937603da511baa6d70c2725363337 SHA-1: e7096bafa420537ea2df24512afd74bb9ec9c076 SHA-256: 8663a619e661eb47008373539545a2dae6cb49067c554459e6b2bda6f3695464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious lure designed to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=manikarnika+full+movie+online+watch+free+hd PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/65158841760.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/72610407997.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/xorekikadidelisaf.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/80064365928.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/tavuver.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/detosafasirugoniwizis.pdfIn PDF document text
    • http://fruitsad.pl/images/file/vovipunudofemid.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/28979120322.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51452d305---7848598258.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/42316189207.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/99001901352.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wisovasaxaluwenemo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/jetekor.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/towopil.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/mexipuvo.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kakeburevibubu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/143c72d10395abc5db994591fb1673fb/kivov.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/74575312157.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/sajewitowawegegonutativ.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/26784266809.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/92573967819.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/fikavalaxixujono.pdfIn PDF document text
    • http://baoveantam.org/upload/files/nimugexufavuto.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 19064 bytes
SHA-256: d6be4a8b676e64f29b0e67ccc2d5094e326a3b9427785eb52b9e2eff4a0d8eb6
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10912 bytes
SHA-256: fb43ed30f8487f97d6fe81d9a75ffcd343dbd0e814d8cefea53e215682a67e6e