Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d2547f556e69ac…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a7ece9f38460daad4ca57dc36519d9f SHA-1: 9fa4e158011e62f411dd122c07f14fa0dbbad33b SHA-256: b6d2547f556e69ac434a52daa3c9f2515fae6fd9164568fef7827d0528417da3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=restore+android+phone PDF link annotation
    • http://e-baze.lv/images/site/file/6559229757.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kugugagir.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fezirumoveber.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/dovixogizujaje.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/50654264313.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/57112712260.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/61623007697.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/koredoxutigamoseti.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/141728439329.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/fotava.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/pixebovimivaxufuguxa.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/linogekijuvomopoxamoj.pdfIn PDF document text
    • http://orthodoxnews.us/file/zepigaga.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/37200500638.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614680019da6e---dufinodikagebojumox.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/27162014377.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/nininubamoreris.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/ximadudopokupapofoder.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/bobatasepogazamoxere.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/13417681075.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tavotoduto.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909085133.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/60637664958.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/80384314455.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vixowuvavonokopegejepada.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_024715.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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 17620 bytes
SHA-256: 29b1cb7f36366f7eb18fb4c9a40df5065565992036ea88212c7725dadb4edab7
font_01_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 10488 bytes
SHA-256: bfcd10be7eef238cbc840dbe91fbb8ddfb5c109753810bf117f5d7a70583d952