Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918443c52e825cb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f854e73d6815e5a8c4b08936948a508 SHA-1: e4adfd1ae28959ac1cb501353782f70d834f5ccf SHA-256: 8918443c52e825cb91693eb7b14a89437e752c3f1b795cab88f012cc1e527b13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to suspicious domains and are structured to appear as downloadable files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://abw10thstreetne.com/uploads/files/zulori.pdf In PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/rilokumoremu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/balalaliruvumazuwolagit.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/16147775250.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/58756918819.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/64309321290.pdfIn PDF document text
    • http://tcihk.com/userfiles/31915190324.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614451ad5ba32---78094706803.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dedikezabisafugawaneki.pdfIn PDF document text
    • https://aneri12.cz/res/file/buxumegojunif.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/19025424150.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/kopalasukadolusenagez.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pevagugekopepumamobasuxux.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/27995161132.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/soresovejimudebuse.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/wakilujinejuwoxipiraziv.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/26170584621.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/selakosimiv.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/velalatapugagigoxem.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/2571696315.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/61308486558.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/luluduganixasoler.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/18444979442.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/watexekelu.pdfIn PDF document text
    • https://arerp.kr/data/file///38467005578.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9a9e029fb---15409222572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+rules+of+life+book+pdf+downloadPDF 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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 15444 bytes
SHA-256: 14c288736c47bee37eb4f651c9a371eb958876e163fc06fd9e0a33f33edc44a2
font_01_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 10876 bytes
SHA-256: 5cd87a887a8d39e5bcba541ce06162e7fdd9c740ff4da20ab2dee174fbaf4449
font_02_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1