Malicious PDF — malware analysis report

Static analysis result for SHA-256 18faffb8b81b151a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 18:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d70a26066c480a0ce9879859db1979ab SHA-1: b4230a2c249673d5361d14ae5a14e904f6d2983a SHA-256: 18faffb8b81b151aa11df01795c6af30e8147dd60fa6be8c1a90b56087c080c8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a critical heuristic indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external URLs, many of which are on disposable hosting and appear to be part of a link farm. The primary purpose seems to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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.
  • 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://coretry.ru/uplcv?utm_term=how+to+turn+off+voiceover+on+android+phone PDF link annotation
    • https://mariapolis.es/ckfinder/userfiles/files/47163861586.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/46090182731.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gimanibawamavepewonitav.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/24856667622.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/nefufabikusudexig.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/lajimofinunomokufigebopug.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/fuxonafufakef.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/romazefitiji.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/zorup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8a4e1a33.pdfIn PDF document text
    • http://jaqalsports.com/files/file/69285941464.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/vixosozelizomasef.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/dokezi.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/15995713304.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/10330300636.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/52566109597.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/41170458166.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/migegow.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6931033319b15a8d03b0f1c30a25a036/14692425004.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62443884373.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/47173056563.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/1324650044.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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 10748 bytes
SHA-256: 86e1a20471051f49d44c7afbf0b068a90ccec9936f0ece8093d3fcdf09bf2bc6