Malicious PDF — malware analysis report

Static analysis result for SHA-256 89648cfb84188d27…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 15:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21cb6f2007256e4b775b1078de9f3599 SHA-1: 98dfcdf30dce504ad4f77dddf3797f479f66d119 SHA-256: 89648cfb84188d273c6b59d79de8aba6abb6974c52f1e1e044312fd185338c48
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous links to disposable hosting. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, strongly indicates malicious intent. The embedded URLs are likely used to redirect victims to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 69 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.
  • 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://medvor.ru/uplcv?utm_term=cooking+conversion+chart+pdf PDF link annotation
    • http://luchetti.it/userfiles/files/28908509941.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/92912077032.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22691879414.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/56143143494.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/keniwozo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b247877292a0a7edc2618fbdc29a337/barozetigime.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130823938d68---22517256118.pdfIn PDF document text
    • https://computerzone.pk/file/zelodosapisovu.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/75138990578.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/puzukod.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/31183001453.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/78245181548.pdfIn PDF document text
    • http://anindecor.pl/files/file/baruviduzulixulexejifik.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/zagabadep.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/98046438889.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/retuwaragowafizekesigigew.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/waviveku.pdfIn macro / runtime command snippet
    • http://suphammamnon.org/uploads/files/sufigumipaxivabusepa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lidebubifexipubexatur.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/nowemizaxadewunojubikopu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/53958235928.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/80689171829.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/76203189300.pdfIn PDF document text
    • http://mstreatmentadvanIn macro / runtime command snippet
    • 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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 11040 bytes
SHA-256: 6be70e63b6ebb66d5c4bfbd00e2076f9ff5142479eac08ccb785f730f6347ca5
font_01_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 14432 bytes
SHA-256: cea31b749514fbabb9783f66ed42f8289353df612a04b4d3058f8531718890f0
font_02_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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