Malicious PDF — malware analysis report

Static analysis result for SHA-256 accbf96fc89d596a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 03:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7914adb09e7a64937fc1a8b426dbd3a SHA-1: d36ff0327c5a644f2729a995d74dfa3ad3cd5474 SHA-256: accbf96fc89d596a703e701e41c7732eff5e2b43328d7f3bfb5b6bd28fed4831
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis identified it as a link farm with numerous disposable URLs, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the embedded URLs and link farm heuristic strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://fotofolliasanlazzaro.it/userfiles/files/28108408511.pdf In PDF document text
    • http://mrcookie.tw/upload/editor/file/011000508637.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/82351894754.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/54786239241.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gvj332v6dg45a0uoso9gmf94m6/waposobaredam.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mowikabiwovudarelonu.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/dameni.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/difodoreri.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/52267910644.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/52481189917.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/palazig.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/jikedinerodur.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/viwamaxezategefasana.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/35287516566.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/1519335879.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/94280060558.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84028500658.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kunobozojorebirofim.pdfIn PDF document text
    • http://cx-gl.hu/images/files/39971883105.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s5vnlhln3burs0vtqn28ufue16/10586352563.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/mukumufumedusuvixe.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631158167.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xotujikigerozotiwazibi.pdfIn PDF document text
    • https://badrivishal.com/media/rejurumikefazosakujed.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jagevupisugafemexixibawo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/46730641410.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/1376959434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wps+wps+testerPDF 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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 9800 bytes
SHA-256: 0651a1cc380b42a6e1ed6f65d7c407d03985d20efd0800affb7f94bc955f2dd9
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16528 bytes
SHA-256: f40ab12efc2d505c49474502a3feb863fc30eeef4a044d3da7239710b4ebfafa
font_02_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1