Malicious PDF — malware analysis report

Static analysis result for SHA-256 e040a95563b3659d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 20:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b2ac25f5cd35756cf32fcad6e3afb96 SHA-1: 59a998b0265b8954fac5efe95c922f9b346e56b2 SHA-256: e040a95563b3659d5c10237f4cb39935b800a24f433b90e00a89e2f6c9c2a309
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of distinct hosts with few links per host, suggesting a link farm designed to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/20551857846.pdf In PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/21992011388.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/19110738474.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/31372303081.pdfIn PDF document text
    • https://yellowstonewildlife.com/35131360558.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613065629615f---nifogejoz.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dawuluzalepixat.pdfIn PDF document text
    • http://cissi.it/userfiles/files/35056855190.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/16937385463.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zibonidusosakeboda.pdfIn PDF document text
    • http://kco.su/userfiles/file/sepuwula.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35769286522.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/femibozegezoz.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/61812556607.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/49973990627.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/81587856822.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/letatin.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613720b142883---wojeses.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/21266038196.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xijewa.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/lixejir.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/85300354494.pdfIn PDF document text
    • http://safetruck.gr/images/file/85908652270.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/gajatojozaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2015+aha+bls+for+healthcare+provider+student+manualPDF 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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 17860 bytes
SHA-256: 19194af5b4a528fa752a3357b98b636a088bc0f4466b954b2799ea2b28d19615
font_01_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 11524 bytes
SHA-256: d451c3f04f496e20c1505ab15b2a1a4e2350d720ab569b570bfe849407218eb7

Open this report in the interactive analyzer, or submit your own file for analysis.