Malicious PDF — malware analysis report

Static analysis result for SHA-256 123d6bab7a8b0dee…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6027262e064718742f7be6f1c57f122c SHA-1: 39c50d836c1b584b07eb6f24eb130bea47a456b9 SHA-256: 123d6bab7a8b0deea9722cbd9a3194864474bcfa1d22d695d3d808e3ba57122f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many links and the 'link farm' heuristic suggest the primary purpose is to redirect users to other malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f955b603---lezes.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/gudaxe.pdf
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/zikikaf.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/sesiwovimazog.pdf
    • http://machin.kr/userData/board/file/66786791821.pdf
    • http://hbisan.com/userfiles/file/97675751194.pdf
    • http://iscelenie.info/files/file/jiwizur.pdf
    • http://tuanayapim.com/rsm/files/nodavosupozogijijimixe.pdf
    • http://yksskj.com/ckfinder/userfiles/files/degivaxilexetarowiranak.pdf
    • http://kfnmdg.com/upfolder/e/files/20210903055421.pdf
    • http://darec.sk/files/files/40196989970.pdf
    • https://worldcastlive.com/userfiles/file/16282245841.pdf
    • https://juraganmonyet.com/contents/files/gupexidigogatamosuw.pdf
    • http://kystar.net/filespath/files/20210917004633.pdf
    • http://itcck.org/upload/editor/file/bexasakiviwagunuzeta.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/solunesekubibuki.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/85690654829.pdf
    • https://doitoutdoorz.com/file/UpN2vmtc3Xzlfls2.pdf
    • http://telektrans.hu/editor_up/posarexususimasikig.pdf
    • http://grupopiscis.com/upload/files/jazan.pdf
    • https://vieclamlaocai.vn/webroot/img/files/nezuboxizoxo.pdf
    • http://agama-rc.com/upload/files/selasiponowuletu.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/58017268123.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/porirupalunaliripufopima.pdf
    • http://newabel.com/ckfinder/userfiles/files/25318088983.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5e.bin
a416ecbf3e5bd96926aa2054c27dc88c7823d3dc0cc9c28096109d1bec5cf1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 18112 bytes
font_01_sfnt_off00010cc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes
font_02_sfnt_off000124d8.bin
8255732a56b0e73bd9cc4d8cb1924d8fc55d4392d36c752543cf3e8138d50ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 10876 bytes

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