Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc44d1ff72d9ee…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 19:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77012f346fdf59a9a382bc4842f4edf9 SHA-1: 5586bf30f3b15031d3012bf9ca086c3045bedeeb SHA-256: 9dbc44d1ff72d9eeb62213f420bb1ac568e840f1369903275c88695e4edcb13f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The critical ClamAV detection and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • 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
  • 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://laborke.ru/uplcv?utm_term=new+update+for+redmi+note+9+pro PDF link annotation
    • http://picart-personal.pl/fckupload/upload/file/vodibolimo.pdfIn PDF document text
    • http://espokebar.com/uploads/files/52259032600.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/bidase.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pobapen.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/6097243684.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/2909563140.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/44441170370.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/22706441262.pdfIn PDF document text
    • http://packamate.com/userfiles/sonikumofumef.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/63962858311.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/novazonufowusozitabado.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/5508768739.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/zaxaga.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/ratazudupufenafiz.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/21437797186.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/foxujeva.pdfIn PDF document text
    • http://fruitsad.pl/images/file/kufubine.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/77208006338.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/74834201541.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d2f531b2---pujaki.pdfIn PDF document text
    • https://parc-hotel.info/file/2672832235.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/jumelisevabex.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/73011732458.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8a8c259ed4f958a37e538226b278aa8d/82458256010.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 17660 bytes
SHA-256: 6041b83a47845da5bcf65a254f2825c950a07497d09261d6b82da54607b4d0e2
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1