Malicious PDF — malware analysis report

Static analysis result for SHA-256 178892e3d264565a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-29 12:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e5e12760e854d02aab6f4fac1710aac SHA-1: 4405eff9d8bf6d722535442c11b787c8ca79ee6e SHA-256: 178892e3d264565ae2c001666c5f2ec621da77fda21677b63aed7066b1bbc5d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=standchen+schubert+pdf PDF link annotation
    • http://fskyok.com/uploadfile/files/14629252342.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadiv.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/dadezamorasujixagujefox.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/54311320878.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/15512201027.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/kutomudewo.pdfIn PDF document text
    • https://norservis.com/files/files/6750479621.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/sumomulafijulusevamadego.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lefumej.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/9313024404.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/49762771165.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zimixawavopujuwuradip.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/60661484146.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/maxixu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520ad6b3ee7---tewebofuguzisapokedet.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/25739758065.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/3475470027.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/pasitipitamov.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/zosuduxavazow.pdfIn PDF document text
    • https://parfumzone.ro/files/file/6780455142.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/40200450894.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/66250033324.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/99346388914.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 10776 bytes
SHA-256: 6f7f47db5aa425942417ae7174ea2560e7e4800c13bd9c5cdfe487fa8ada4aed
font_01_sfnt_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 18312 bytes
SHA-256: 3d1da6f53588b47798d48b031babe8997b5717183c97b7626828e744244f1c07