Malicious PDF — malware analysis report

Static analysis result for SHA-256 d728e429cdcecbca…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6014ecfc0c976ad7e5a5d649eb39385a SHA-1: d1eb4f904cbdfb185aefe888771a4c1a54b486f1 SHA-256: d728e429cdcecbca45829db9b745fcde333bfd0f3167ea8df480f1ea59a36d06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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 https://huntic.ru/uplcv?utm_term=download+google+voice+for+android+phone PDF link annotation
    • https://eobliecky.sk/userfiles/file/85022351553.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/mosodefuwurixixipajidol.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/vufebixepavat.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/luvexotanebek.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210915200842153.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32129851895.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16177443872.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/62994056072.pdfIn PDF document text
    • http://stromzeleny.cz/file/dulotekuz.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/rezujetelovixovix.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/30757158420.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210913151745.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210911105255_379274065.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/xekew.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c389680e9---81901378191.pdfIn PDF document text
    • http://otczenacts.com/media/files/neraxitepojixebujulago.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jevvetp7r9ibvq2ahjluessl21/14015794021.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/kelovutudurakamuwiredo.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/23968044709.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/teburudofoforaji.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/60661445648.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/wilubafigilop.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/44378095520.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/80582551917.pdfIn PDF document text
    • 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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16640 bytes
SHA-256: 378a84c0f15a62b014f6066094be2f6f4c21126e5868f4ac1f6f7ff722426372
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10788 bytes
SHA-256: 15187358f40c4430dece0821c68687e70ef113cedc5eba4825926b9ead1aa57c
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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