Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd3738e2613eeb…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 02:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d97cd8e77a04a32c0aaf6769534d271 SHA-1: 8814fd002c2d76886abc5a8bae3b5b95d286e5d0 SHA-256: 79dd3738e2613eeb75a99d3ee16eefa112010fa41ef429333ea0c80169b4a3c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes an image-only lure, a common phishing tactic to trick users into clicking a link. The embedded JavaScript stream and numerous external URIs, many pointing to disposable domains, indicate malicious intent. The ML classifier and ClamAV detection strongly support this assessment, suggesting the document is designed to lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://agmapure.com/upload/files/sakaromagijelepi.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eae7d0508---8472051098.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wiwasuxolan.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/muvogukowebumuv.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/zuzumobajatunepew.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/mujenevarivapexakife.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/lutetevukivafutu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/96801703699.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/18634427454.pdfIn PDF document text
    • https://jagominum.com/contents/files/92787692360.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tuwepufofulo.pdfIn PDF document text
    • http://chemicalengineers.ie/images/telol.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/samejojewodotefoliwakov.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/23998825728.pdfIn PDF document text
    • http://veitali.com/upload/files/64249669000.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/sasirufimunofewedujaw.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1ac2ab1fd---xopesejejewosisaw.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/70924554311.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/5012503010.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vutodawomogolu.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/lujapaxiro.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/97011091509.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/60920925239.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/46197785626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=things+to+do+in+athens+gaPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/6698388731.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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 10344 bytes
SHA-256: 672fd89fde02bd8f1371bb758ae4298493211c196cf40082f4b057da177cf274
font_02_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 13904 bytes
SHA-256: 8870d4496ce93b60f46d30bc84c07f50214d650d3e7b959ed32dadec699fd4a6