Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3836064f7bfca18…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 03:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: edd279c755abafc0c929328f6d678167 SHA-1: 5e79a8f10220d36adad26f54ffbe96530ff8a637 SHA-256: c3836064f7bfca18651b66fb189b5669de4a46219bee8ec3640360b4f5a757b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://buildingexpertsdirectory.com/ckfinder/userfiles/files/67962047455.pdf In PDF document text
    • https://marsanz.pl/uploads/fck/file/nonidib.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/81827663121.pdfIn PDF document text
    • https://sim2007.com/files/57223098509.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/mugepujitakawupodoreni.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e78tu7kpsbm0fh5qn8cgu49qq1/dowevowusowavozuwusaga.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fizewibabopewopolubuxuwi.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sagedalasarefevifepat.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/80474294411.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/panelimipojexu.pdfIn PDF document text
    • https://luminex.pl/upload/file/85771463281.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xetomaketuxowuwen.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/komosobiduzasuta.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134afa894c70---kopovuden.pdfIn PDF document text
    • http://ranchobg.com/img/file/1487528240.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/galarivomojavefavipad.pdfIn PDF document text
    • http://prograsifkalip.com/files/ragabewesogimenukifa.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rusidiwerod.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/40916136944.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/kavewir.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/pofak.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/retigufal.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/bexepixemokaresej.pdfIn PDF document text
    • http://marketingnews.fr/images/file/37383983553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vita+app+no+watermarkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fekikaritekoj.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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 10348 bytes
SHA-256: e899c92c708eaa8547575a1e28044ad3beb58eabd0c673567add3cfa0e978efa
font_01_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17268 bytes
SHA-256: b4cb84008624206a139f89b46ba6c9c07994bf41d6d57fbdf188bac60b72fea7