Malicious PDF — malware analysis report

Static analysis result for SHA-256 e561671a47405fda…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 19:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2ed556dcd45ec23a29f93fae81e1008 SHA-1: 99acdda17810290a26a5a73cc6ddcf018e53320c SHA-256: e561671a47405fda5d82dfebd142756a580af4356c14dd23cb31594e00692c55
74 Risk Score

Malware Insights

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

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 link farm intended to host malicious content or facilitate phishing. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=aplikasi+backup+data+game+android PDF link annotation
    • https://fratellifurloni.it/file/mekoxepoxuza.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/43948032242.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/xofuvukugakokurufikexobi.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/31627465784.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49576642603.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/towajusavusigibovivela.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/97547426742.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142e67720f5b---topemakomegu.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/87857476502.pdfIn PDF document text
    • https://partnermind.cz/images/files/tupibo.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/dunafixajezomilapefu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/58856483405.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/luvudadijusekupodagojakoz.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/88773637204.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/93893410274.pdfIn PDF document text
    • https://hirurgija.me/files/20390313626.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2ea2a203---pafugiga.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/31737454569.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30810926543.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/punazutuxad.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109130932215734.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/86766138807.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/50588384590.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/pedakaze.pdfIn PDF document text
    • http://iscelenie.info/files/file/fuxabizaxifajefozekofifom.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_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 18092 bytes
SHA-256: 629910315d1b96469471b6df445c8bb882b93ced7d8bb309a54d2562dec475fd
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 11172 bytes
SHA-256: 57f655385e43691aca2a75e8ac0651da42fc83f34a88687655cae14f344304c0