Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e054e661dc2da12…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 08:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08fa81b849d24168c8370722cdb0b989 SHA-1: 1a7dbbdfe67a4c8cc46b45174a460ea27838700c SHA-256: 4e054e661dc2da12f16d31d523f3f40eed4b78be8ff459072e6197ab6fa2ec70
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random URLs and being classified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing malware. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://absoluteanytime.com/media_file/files/files/60190577480.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ef9c4d4---xiwisudikufumegil.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/11727915257.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/wajakugadapejosize.pdfIn PDF document text
    • http://swhos.com/upload/files/bamulawajifonitonutopoz.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuluzexipotadinamu.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/vawogotak.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/9769054610.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/wunafovasasoxofodanebuxe.pdfIn PDF document text
    • http://soupworld.de/upload/file/15341952853.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99523998009.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/sokifepelup.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/686cf3fb0f18c5841d9c710e9a10d60e/bogidotixubudiseselaki.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wulutiregi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/52762457530.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/72862791004.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/30671479958.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/fofipi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/36146011549.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109152147505186.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jonemaji.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210904_12E4F6D4BBE356DE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=organic+chemistry+class+11+book+pdfPDF 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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 17500 bytes
SHA-256: ca1df59289c1039e9c7c9c4cb5dd8cdc57f0d97a259cbd94f14436675f076d73
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 11488 bytes
SHA-256: 2a2b02a7e6547234414d36fc1d62aef2ff1e4de465425473101b4761e1da24a8
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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