Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6ce55262171ec0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 14:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 502f7509426ad27be1219407541bb4f4 SHA-1: 5a12003fa7c733c2b98ee90c9661720d4de2fda6 SHA-256: 1f6ce55262171ec02d10ff3640c970402f0addce69d5c23cf11f58838f072912
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=vijay+the+master+full+movie PDF link annotation
    • https://girisimhaber.com/uploads/file/fedide.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/wamunotopazabagorole.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/58017449339.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/78684025184.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/negawekeziniradi.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/dukutula.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/90506286989.pdfIn PDF document text
    • https://alpinashop.bg/files/42585358056.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/ledazidegu.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/41139292369.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/7063025069.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/tebejosazozotasi.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/7827599973.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/77668290307.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/xofubaxosex.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/jakaja.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/95837889536.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/55790668154.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/21048227221.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/golivorigi.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xezuso.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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16304 bytes
SHA-256: 9f32b0cbc02a19e4eb8877b2c5ccc6e29a0cf2a565d9d08282c4734e5b7690e3
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10756 bytes
SHA-256: 69ff0e354a79ae9b86a68964c69ca36230831e195d49dacaf06b29b1f92a24b8

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