Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ccc75d1778c39c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 08:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 297a1561bec1e562bf552377644c983d SHA-1: 59740e88ac745348e5307a68bbdbf900139885a6 SHA-256: b9ccc75d1778c39c8bc49a570202867eeaf400d8caad671bbe9009db8f0a392e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, and ClamAV detection confirms its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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
  • 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=nice+games+free PDF link annotation
    • http://fosterfreezesantarosa.com/uploads/files/93429646783.pdfIn PDF document text
    • https://alohasafaris.com/files/xesalamotelo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bc23a4475c13b052b5c7e23d83a1c96f/sojijesowipe.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/52577628085.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/71752698757.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/80124987795.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/65796044217.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/dafogi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/75629660268.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zugem.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/somulajiwokezatof.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/fevexoxoxixikuvite.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/bonefefubaw.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/4592177831.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/53425801227.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908154910.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/fotupefofetidawa.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/fawulezubiwosinugi.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gebawutidafozas.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454d7e12054---xurerevakosidi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/poviritorakup.pdfIn PDF document text
    • http://strandedtattoo.com/file/91052312131.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/tuwise.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/fodudodelasa.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74569928783.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/69244074590.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10288 bytes
SHA-256: 871af367908640a59a848e058e42d46c37ef3943f0db60ece105086c3428d865
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 18148 bytes
SHA-256: cbd10095078ee9f85f4ef37a047c19dea5692a580eb59c6a81e26deb7e190b90
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1