Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf2335532e6edc5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44e0c4486fa1623c88a2fa7593e02ca4 SHA-1: 3d766440c6045c5e9d4a76ab4d72e6aa5ac31af9 SHA-256: cbf2335532e6edc573469bd0fde6abad4c385ae38384337eda500f5af5d8adf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rajatotogroup2.com/contents/files/perek.pdf In PDF document text
    • http://www.og2c.com/images/file/fagarija.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/29742267047.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/komepilezuxifota.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/wexetaxug.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/figebejuzukefiboxaw.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/ralikefomowamowet.pdfIn PDF document text
    • http://deforma.it/userfiles/files/79243235182.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b3418fa0---34245367064.pdfIn PDF document text
    • http://futboltotal.net/images/files/81754174698.pdfIn PDF document text
    • https://andrejc.si/files/file/87438893944.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/75770337245.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/sabadaropiw.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/wonesozokiwovojinipat.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/19482282831.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/35662424669.pdfIn PDF document text
    • http://hangquangauto.com/files/76329172470.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/39450754999.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jumimitepunu.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zobetojinak.pdfIn PDF document text
    • http://getdol.com/page_data/file/77951451990.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf4f419e1---pesuranerijanebazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dungeon+hunter+androidPDF 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_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 10416 bytes
SHA-256: 629e0949cb7b68caabe0d07330ee5098196910bcc2e459bfcd374e99b5ba6e31
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 18436 bytes
SHA-256: 25667d45fe7e513b4b4b4301ff59987603f07ffab61ca2e820ac0b5968c00b3f
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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