Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ef6990f78c6da1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 00:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb1f15ab4c6c1e5fba61c0429c7416e6 SHA-1: c217c03fb78a033d0044c6ff9676e9cef615067c SHA-256: 62ef6990f78c6da16c4320b6cbf57ceccc1bdc78c6a507fae01d18636a0d3ec1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eklyps.net/images/file/binulolazubezipanopavu.pdf In PDF document text
    • http://goldia.cz/data/file/xefezogipasotuvazo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5b79a310---68349963491.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/9871228911.pdfIn PDF document text
    • https://badrivishal.com/media/4266365482.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091102325673499.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kusazelevef.pdfIn PDF document text
    • http://splogservice.ru/content/file/61353873387.pdfIn PDF document text
    • http://chemicalengineers.ie/images/1264092083.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/losaroxemujamazeroromebaw.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/78454081048.pdfIn PDF document text
    • https://limsurdua.com/contents/files/12842824978.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4094bb3585632f26804ba899a0e23196/50682530489.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/71073036375.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///7466206912.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fufewexonokoxekifemexe.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/bajotabulemalapinaxan.pdfIn PDF document text
    • https://steammining.com/userfiles/file/17926909540.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/75962276959.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/bidamifajejesemasir.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/90155446557.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109011003441724.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/kofetolabaxaparenuwiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ensayos+cientificos+pdfPDF 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_off0000cd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 18536 bytes
SHA-256: 9c60e9de90eba0bb72bac69ffb80a2cfd0104c1067f79c71f64b4c452b2db2de
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10564 bytes
SHA-256: b541a5529f27157e6c1c76be9ae086af7fcc2ae55bcfa562de41bf6c52b5af00
font_02_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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