Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5baba5236b48e2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 07:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da42f2b4eda38c35c847ffd60070984a SHA-1: 1406c7058acdcaed70cc81739010e77a27217386 SHA-256: 0c5baba5236b48e27711cc62dae99081b7601062bb3e2d04d77c37f103ee7d2e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PRC/3D content and duplicate object bodies are common obfuscation techniques in malicious PDFs. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://kaymccarthy.com/immagini/file/32967321525.pdf In PDF document text
    • http://mikomisushiwc.com/uploads/files/4575559894.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/72579367409.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/bezuvanon.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/62752891687.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/dipaxisutum.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/99491538369.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdfIn PDF document text
    • http://inica.org/files/file///wozupelusatemosigiso.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/23833987948.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/88439547764.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/sunigifekozadunojujaku.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/15015775484.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/peleginij.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/jinowile.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/luvajitiligi.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/donizusedajenapifuze.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/12226258663.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411114c8784---72782966803.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_050443.pdfIn PDF document text
    • http://sql110.com/pic/88001005039.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/boxugomorukiv.pdfIn PDF document text
    • http://idd.no/ckfinder/userfiles/files/vomamowasalifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=carx+drift+racing+ps4+cheatsPDF 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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 10944 bytes
SHA-256: 17d0f933c7d15533f61982c62de3e597b2c989f3bcc1499c2212f2d42245d8c6
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 20032 bytes
SHA-256: 838fb31180b998a0e56a246bf9c94f0946cfedde04039dbd59f1936ba13a0335