Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1927a9a704c884…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 00:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dc7ef8f6a3a55db1f7a9fdb78394e8e SHA-1: aa4423ffd10345944d6cf1d4c1cfba0de160f696 SHA-256: ac1927a9a704c8842ddab3ad0df96e3a533b24a3a31319e99e36e4db0aa1d229
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nusamulticentralestari.com/Uploads/userfiles/files/36701852520.pdf In PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/84496772453.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/vakizuxetixej.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/wegelepamasexefuluninavo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kumewil.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/xekinezexa.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/9184681584.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/37042733529.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352d159bca1---49663898049.pdfIn PDF document text
    • http://shahgrp.com/uploads/pafezilatikabokovisu.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/17365745720.pdfIn PDF document text
    • http://serting.eu/userfiles/files/bonim.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/70319147538.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/97934771325.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/sukerewov.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/xuzofofegividuwak.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/67222358891.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/16376938847.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/powagopojuzomifazibuzi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/larifozeburupabofobo.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/ninenofijoradagomebuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=world+best+game+battlegroundPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 10732 bytes
SHA-256: 146c9a1b1b175e32907fda2101a7969e0fb6dd09196a6b41f61f8ce7e1ad6d99
font_02_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 17664 bytes
SHA-256: 436d54723a2c870322182b02ffbb1164fcc74329c1842c159e62925cebdde8bc

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