Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c163ed279ed38a6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 13:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 197c313618687565c79bf409f59e2261 SHA-1: 13369bf3c1878a1873e1527cdece93e82db5aee5 SHA-256: 8c163ed279ed38a6cd70011f8fe5cd454ae390e6df5b7a8772bfa26b59555ff9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external links, many pointing to disposable domains, indicates a phishing or credential harvesting attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://swaving-stalinrichting.nl/ckfinder/userfiles/files/63958025440.pdf In PDF document text
    • http://sirindhorn.net/upload/File/nemuwizolizubawanoloxo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/losemowexosofejidesoge.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dijofu.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/nudumusovuduwadakemudo.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/37185538762.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/50555392695.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/20345629699.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd0fce39c---dajimisavedeforababu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/puluxajobuwume.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/matujixuvi.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vomuderegozajavunejata.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/98996557667.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/fojufubalilanazovonev.pdfIn PDF document text
    • http://farashimirooz.com/files/fewomasusidefivi.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/28468355102.pdfIn PDF document text
    • http://acelybio.com/upload/files/rejademelinovezote.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xaxababovezipetukipox.pdfIn PDF document text
    • http://fullx.net/files/viwawafuvakitukepewikum.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/36266337866.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/81563224061.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/kupuxezusok.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/bugirajigenapebobuw.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/murapuxujeditubatumajo.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/79369788164.pdfIn PDF document text
    • https://telorgabus.com/contents/files/49994536673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=metasploit+kali+tutorial+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 10572 bytes
SHA-256: 8c020a24e0810886c07c22a18f0ae8182c88c896845530328694f3eb9c6ef1d2
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 18504 bytes
SHA-256: 41a8b981d421ce354524b420010329fee7c822df55055712a3e0c30fc9cc9303