Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd0f121e1d79e58…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 22:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69c4d3e23099b80a94b4472271bbc5b8 SHA-1: b48fe621fd90ea82afb87773c8a31236dfc25afd SHA-256: 0bd0f121e1d79e5894c1a601dc7210ffe4cec51832bebc7120ed8d0f9ef664ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=ben+10+protector+of+earth+game+download+for+android PDF link annotation
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/6366703492.pdfIn PDF document text
    • http://netflor.pl/upload/File/jolevewujazereza.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/runatibonodu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161443268dc63d---15188951057.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/majezez.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/42925598264.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/rigaso.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131305e469b5---zawik.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/88304136340.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/64668062385.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xuxusetuvusimugi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fulasekefodig.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mezif.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/fokilonuzavumekadoxora.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/1412051198.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/80359406643.pdfIn PDF document text
    • http://195exim.com/datas/files/vadakufedamumusujinex.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/tonufusaludozudefebev.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gavumizelip.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/ponabevaxigesitejuligagav.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/6296948905.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/9609066377.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412c6eb8f16---zigebezatavafakudav.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/gejup.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16136 bytes
SHA-256: b2ad8da2892f89196f2c684153f7255fdb9b757e43237e9fcd166f563643598d
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 11212 bytes
SHA-256: 00fc6cbe3a4581f47e3aa82a59512604562ada5e134b69d5d5c49ce5544e1bdc