Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5e7d44d9a44f22…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 04:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d3a19f5f0dd8f810c2065104eb3e8b5 SHA-1: febd247b932cf94c47280c2d029e8ac8995c1a7b SHA-256: 7e5e7d44d9a44f223c197dff82bec1ea2e546353c17b3574de41a1e20509341c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that mimics an Android update notification. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The document's structure and numerous links to disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=android+update+download+paused PDF link annotation
    • http://rebizplus.com/userfiles/file/vexefevezazapeto.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/27293054150.pdfIn PDF document text
    • https://spacio.hk/attachment/file/69977876111.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tijudazafoxetenamezera.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/josasoturedesisetev.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613378b294774---8355266531.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/79957835214.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/72127784083.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/22331490736.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/sejedobivututobinerunavor.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/79170262127.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/wedozutozesalevo.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/13114545445.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/vibulenutovubaneti.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/71816310122.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/gutikarojimataveli.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/33218863086.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/tuvitefu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/38382787954.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/60223091430.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/pepifap.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/pedaxi.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901140945_0rxgom.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/edbrc8j55mmbnaocsrbeqmtn7e/xisorux.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/95444533201.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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 17888 bytes
SHA-256: f69074a8042efc9894b80aa8bf722202cdb07bf6be88624a12ffdf663f8ce614
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 10552 bytes
SHA-256: 3a9486ca326674eefb71d147dcaf8ed50cdad90a065e989d4f6a2da6cee3d6cd