Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff691dcade4c418…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 15:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adb7af1c0a5f7898cca5728d37b5ef07 SHA-1: fd7a473206e15406378e47896773842dee6d1c5f SHA-256: cff691dcade4c418ac12ba367579fb80a2aae3aeae75341f42965e044ce3c3fa
166 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to disposable domains, a common tactic for distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_RANDOM_URL_LINK' specifically highlights the use of algorithmically generated URLs for hosting malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://eastindiaspray.com/suvra/eastindia_spray/files/xanedudowakisosuloduw.pdf In PDF document text
    • https://vonia.mikludava.lt/images/files/41781861793.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/japojozero.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/mulikoserimusib.pdfIn PDF document text
    • https://ekransamara.ru/files/ripabibejozifasuxix.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341c27012b8---nonesajipepovupa.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/99066989204.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/73693169014.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/71969769881.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/jugulibuwenefagape.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tanugemapilusisovijukaf.pdfIn PDF document text
    • http://pi-consulting.ch/download/kanikunatuserexagug.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/dipakipa.pdfIn PDF document text
    • http://elpijisystem.com/file/nakekoxokog.pdfIn PDF document text
    • http://fitviewer.com/files/file/5245759670.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/77547368710.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/fipupolavolojotisepusama.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/luzukizarokor.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/wijedabekare.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/unev4s3nsqh2ldc7ijt174vtl0/lafakikozetavudunux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=programas+para+espiar+moviles+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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 10704 bytes
SHA-256: d02bd1c06e5ff09c2eff17c62f6be079e76bc6130c1faf30a492d101841382ec
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 18832 bytes
SHA-256: aafe82341ce22ada5bb9e898324440aecb886994beac2a15c496a856b8e44421

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