Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fa9a304d612866…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 18:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd283aa60e85254ef2b47fd6b51f6c2a SHA-1: 6eef78d9b7351218cbaabcdf286717be0202d213 SHA-256: 86fa9a304d61286688d8ccbbcae3500b6ac4b5a488f0eeeda694818edd8522db
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with several heuristics flagging it as a link farm on disposable hosting and containing algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://cructi.ru/uplcv?utm_term=best+pixel+games+for+android+offline PDF link annotation
    • https://ms2gacor.com/contents/files/37556101282.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sorazofufu.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/71973692591.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/lavawetewuzorosasumawa.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/dunusejabovirazosagok.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/jolonaligipasemawose.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/leguwepijosomalub.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lobopi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jepuvexakeximevaz.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/44297093904.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lowatesadetanewiwutonidol.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/6794825222.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/xuruvipijenufurunidewuwom.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/24423472619.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/89341048163.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/46892852459.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdfIn PDF document text
    • http://prompol.com/media/file/gunivozetujuziw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tpo5pusqnh1q0dt1b8ml6mo4n8/keniwufibefixefuruwip.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/93684550658.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/79340350078.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0359760fc---juxiliwufasadamobazus.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/biselu.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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 10996 bytes
SHA-256: 18330e7c8100ae5032fda997cc5d37978074ec7f2a05604595ae27df06cb4cc7
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16940 bytes
SHA-256: b6a558c2195f8133e5f3fa892c0f7595ec93d2b39ce46c613c8a4346ecb63d5b
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1