Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61ae9bc2360cffa…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: afc02f400f951b71ba7863cd9e73ca3e SHA-1: 296b1cb13acadd026a586275fd83746cf3730c21 SHA-256: e61ae9bc2360cffa7cc7e4f14a98e14dca106692dacb37a0ebad17a13c3f0e7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, characteristic of a link farm used to distribute malware or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152ad5d3b144---59001816245.pdf In PDF document text
    • https://miltonmattox.com/userfiles/file/49507046542.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kizot.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/jasepazawum.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/tejekoxisidokuris.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/zagudukazuko.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/waxojopakalerazokaz.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gogotepokubiradozuxabama.pdfIn PDF document text
    • http://handgun.ee/media/file/24232069616.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/wokeligusivetunefupi.pdfIn PDF document text
    • http://standardamulet.com/files/files/39647579080.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/jugavelopuji.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • https://shidoremicrosys.com/media/76972664854.pdfIn PDF document text
    • http://chemsdano.com/upload/files/90842868352.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/86063852280.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/romifebefekogoxagep.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/29004985440.pdfIn PDF document text
    • http://splogservice.ru/content/file/33585943040.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/14520457440.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf54c99bc---82518594063.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/megevolipudakoxomevuzid.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/miwamilifaxoponod.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/joxiwezuxofotaferegoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=d%26d+1e+character+sheetPDF 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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 19548 bytes
SHA-256: 78a1d717e262b7a9916fabbe7512df4c8dcb24d3cbc492814fa0398a1d0a5f0b