Malicious PDF — malware analysis report

Static analysis result for SHA-256 9729b8a29f3087e1…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 12:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40eb1c1f2b033ba2f038319f84e0ac84 SHA-1: e47817926455521e6bbec3571dc2299fed547daf SHA-256: 9729b8a29f3087e15f124fc0f8db725bef19a8c97a0a999fd54ccea1e375b04a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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 https://archism.ru/uplcv?utm_term=ghost+recon+breakpoint+android+apk+download PDF link annotation
    • http://bamila.vn/luutru/files/31550642059.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/42516131547.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/66446253545.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/newiw.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/52154120721.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109101228486551.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/beveseladin.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/6295922805.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/pikegirikanobogokadigupi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/texezibozinirebumorimi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ae03a870fa4846222e2661a56e99bcf0/veridugasut.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/31743621381.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/37314456374.pdfIn PDF document text
    • http://recrute.fr/files/files/17919115070.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/20641264252.pdfIn PDF document text
    • http://eko-uklid.com/files/file/fusesewefasuzageje.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/xemopigolopedune.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f9130d16---92371894961.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ridozuzilalizutomazasa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunipiwu.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/magotenukawefa.pdfIn PDF document text
    • http://feminella.ro/upload/fck/67830077723.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/27695067506.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10968 bytes
SHA-256: 7cb7653fc4aa7b19f1c9ec38a69f4ada9b4cbc6762aa23b00a33cf364806f573
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 18380 bytes
SHA-256: 8b5811a42e675b48d0df762a4bffc5199e101f0e327a523fc77ec7b9bd1d0613
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1