Malicious PDF — malware analysis report

Static analysis result for SHA-256 b734d31779f7aaef…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 13:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84bd947ed7e07947936113a413e0f952 SHA-1: ca855cfdeb1fa9ec2d2f09dbbffe83a8ffc4729b SHA-256: b734d31779f7aaefe0612b05475ad8ff87b9f79a4dd4123fb419d54c90cd8b00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm used to obscure the final malicious destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to redirect users through multiple hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://danguykhoidoanhnghiephp.vn/Upload/files/pukutofujevige.pdf In PDF document text
    • http://conditum.nl/userfiles/file/73002541282.pdfIn PDF document text
    • http://texmet.pl/userimages/file/45549583240.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/83876489852.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/83954465899.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/sufaxowenapa.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/fexoba.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vuref.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/fesusususegewobibixerilod.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/96403591661.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/7008702864.pdfIn PDF document text
    • http://htwy.com/upload/file/rewixixobetilutodukamuna.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/42746324158.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614511d49b12e---bisot.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • http://www.heksan.com.pl/file/17472215057.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bfcc16008302f1f4dc2ce92a5328c7de/ridipadefiruravapinujem.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46687579034.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/55463497991.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/gijebolaretuxoveboxe.pdfIn PDF document text
    • http://balalajka.nu/media/40888423348.pdfIn PDF document text
    • http://grabnerestriche.at/35935247377.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/gajewofudaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cracking+the+pm+interview+pdf+freePDF 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_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 18720 bytes
SHA-256: a2859c3a330ec273bb5d2f7601ee3420fa1e5c72cc951c4201cf7aaafba1ac9d
font_02_sfnt_off000151c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C1 11008 bytes
SHA-256: 015069fd9d011f540e2b998606e8121a2b35c174461d403221cb25de8006c231