Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de0faa175987399…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 09:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf429c85df06517ddc2b12a02cba6d2c SHA-1: 9c4913bdc3f0c55773cedf62249ae2ce75fc822f SHA-256: 8de0faa175987399b978360f2672385345698d728c794e23372b68011b8f0a42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF structure and the presence of multiple external links indicate a link farm or redirection mechanism, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://hoalavender.net/upload/files/junolaxipasafomabar.pdf In PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/21144010051.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/88428930733.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/23266435567.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/11299877927.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/34876984418.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/devusa.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_17_45_34_9710.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/83784701968.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/dalerazuwi.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zosomimogiwoxizikizakeso.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad138ea37---98497074456.pdfIn PDF document text
    • http://upakuika.com/img/file/pupijaj.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100354217957.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/27967048491.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce842914a256539606dd9aeb579425ea/39918511271.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/41838906343.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fuzixudodosodik.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/14999543545.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/xudokojinilimuwer.pdfIn PDF document text
    • http://video-cycling.de/files/file/30545368004.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mulagi.pdfIn PDF document text
    • http://ctm.it/userfiles/file/vonufobujojatebapub.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/vumaxef.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/bomolizurud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bollywood+movie+mp3+songPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/96570858453.pdfIn PDF document text
    • 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 10864 bytes
SHA-256: 5e9f7eb6d268e290343b76473fa7dfa68eec1173206d809c59d5adeb9cde4966
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 15696 bytes
SHA-256: bba0dc095e1c7fd15310f4561e99f0776a45b4f3ed0d427ef25f21cdb7c7a1c4
font_02_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1