Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23a9e7f9328566c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 21:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4e13a4282f3a7c2e66cfd7b05eebd9b SHA-1: 1b01dd06b884f5cfe131f16c5d907a3006ac3149 SHA-256: a23a9e7f9328566c87ae57855d9fdb26010e550c01bfa63e0a57831845f287e3
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, likely intended to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cl-metalparts.com/d/files/61918245970.pdf In PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/lotonoka.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/pagavazulusizazij.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rumol.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/87890112672.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/55679048870.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/40861531585.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wekafale.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/99888367573.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/luxerilan.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/65a3c87c22d0d9ff8e1000aad08cce52/55910468773.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/77327192474.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/rejasoxajedonutito.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/51842194654.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/sajus.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/85556318240.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/22894359719.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/84640814688.pdfIn PDF document text
    • http://amandamaitland.com/images/file/49283081285.pdfIn PDF document text
    • http://centromp.it/userfiles/files/88692222256.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84885095852.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kalatoxigipopabe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136590f8e33c---74093919882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=super+fighter+m+appPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 10544 bytes
SHA-256: 13ec0ac993aacf5f34ded5fa7458bba6ec75aeeb4862870364ce9584d3cbf169
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 17396 bytes
SHA-256: d58c9e295d8b8df3f6022fac2aaede8c8d31059430ea4863d3f29a6e5e7b33d0

Open this report in the interactive analyzer, or submit your own file for analysis.