Malicious PDF — malware analysis report

Static analysis result for SHA-256 4895a901f2bb4437…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e04d88cf3f8bc9418f5291e37996123 SHA-1: 793ed46ebda4783b1abc5caffa872e396928016e SHA-256: 4895a901f2bb4437f47f6ec1d1887250084994e8ffd1c5d9733dc2a4e139f52c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=a+mind+of+numbers+pdf+download PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133448d74742---tagabovabexilinopa.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/45349630675.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/kadugogebuxosezezepoki.pdfIn PDF document text
    • http://riversedgefm.com/files/file/minudadoputinidel.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/xupexafulinikubogapuzek.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_DF15D4F7B211263E.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/91057000413.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/samosisokakozev.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/lepovigiwejubisovoxexura.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/7274102261.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/zogerisoropare.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/pebaxatamamekamigaza.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tivekobube.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/7183852389.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/kotedukipon.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_86B6BC30EE58C6BD.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/wigofadozu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xafenupozipisotaza.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/7544527326.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/viborerigemunilezazidarik.pdfIn PDF document text
    • http://brlairport.com/images/file/gilonaxifekagevijepekise.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5c0587f6---pelupu.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/vegaramavekofud.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/96982322044.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In 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_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 17044 bytes
SHA-256: e8a33a60dfc8aa0e0575571757b74974f14d4deb4f022c14e1ef589924ef03bd
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10868 bytes
SHA-256: 75bf169d7d6978b4722727e46810a43e005d5abc5097590ebc59e160548cdfae