Malicious PDF — malware analysis report

Static analysis result for SHA-256 6764027d4cdcd17a…

MALICIOUS

PDF

95.9 KB Created: 2021-09-09 22:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4062af8020dda2e781806982458af55 SHA-1: c1bceb887a9f36fb89b0148988b57b18f5b3fed6 SHA-256: 6764027d4cdcd17a5613ea8560760005af5b26d9877f041b93b629b6ba4e0222
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to 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 indicates a deliberate effort to create a large number of links on low-reputation hosting.

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 https://smidgel.ru/uplcv?utm_term=game+of+thrones+season+8+episode+1+full+episode PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/43540177306.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/pikudexurulerabaneverarot.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/2538346710.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/22655748958.pdfIn PDF document text
    • https://renetravel.ro/images/files/57760389575.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/dajekonunikirigakasakefi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fisag.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed353f2ca5---71455276076.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/7502308803.pdfIn PDF document text
    • http://e-hematologica.com/users/file/9956242165.pdfIn PDF document text
    • http://ombs.ru/uploads/files/vejunenatukorukixikepokoz.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jugijafovosemezuvo.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/tutidumatodikaxovadakagu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43441025412.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-08-10-37-32-z33T6mnV.pdfIn PDF document text
    • https://webrobogo.hu/kepek/fesuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9mncvd809s10h35v89bt4utd9k/magasupebepobutokefolav.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/zukesatumokowewidadozerif.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/40872507320.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/82390582162.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/jarosejigavidu.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/41125409175.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/nijad.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/duwoxuxif.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_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 19456 bytes
SHA-256: bddd9d564381f3b3703c5aa8b3e32cfc1eb5a41267f12ab9434b9db544eff34a
font_01_sfnt_off00013fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 11164 bytes
SHA-256: aacd663306cfca73d0e63a79c7f909afee588aa9920e33f52f7c6c5a15c32f39
font_02_sfnt_off000159a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1