Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a94349494df6e8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 15:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c261de46c040e813a88f11eada2e158 SHA-1: 417e53a30130a66ca5d6322235868d032bc8593c SHA-256: e2a94349494df6e8dc706fecb7db4c9b353159fbcc00d61a60fbefce83966e3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a high density of links on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vietrocknet.org/app/webroot/img/files/36638982354.pdf In PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/kemiramutawowufesu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f10656e68---xurubesari.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/84347476981.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/50985860950.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/96786337936.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/94766596946.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/14691284537.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/tevolularuzazaramopasem.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631432794.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/rulogigezevodo.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/19780951235.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/tesoxanarabelakejux.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jewerevofa.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/jusokaxosisabojozefo.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/78658877404.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/63897714977.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zivosub.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614730571afa6---laganetabanajeti.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/34512680934.pdfIn PDF document text
    • https://clinicscrm.com/img/files/33725066045.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/48755904200.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15484170356.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/79324944066.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/1234813689.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/78756702225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gta+vc+cheats+for+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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 10632 bytes
SHA-256: 071afc0aa6b5ac917dc9f8101159556b7cd541ddb16111ea9ed81fab5dbb9b33
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 18244 bytes
SHA-256: 19311b07e07bedbffb37dd82aeed9a330888ae6ccccb6eedc01585a16e1372f6