Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9719c4800d6b80…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43db991c85de6ab63fec0aa6c67d90c3 SHA-1: 24b1dc8c00095dcf750d6407d2c780c6e69c9ed4 SHA-256: ea9719c4800d6b8057b7165dce36407c32061dfb210d10eaa5970375042bd7ca
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, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://avtokapriz42.ru/userfiles/file/30630676791.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/2021927029254364.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/55243738968.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/lozapusodenijewixolapef.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/53584833977.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/maxoragigukumap.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/37616290023.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/69976776097.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c42d9846f---10620004052.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/83687686180.pdfIn PDF document text
    • https://airshow-bg.com/file/66697495558.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/zedemikasurojokujufotim.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/daduremuxozejabetifurez.pdfIn PDF document text
    • https://renewone.de/files/kokipanuvupirij.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/marufadokuluzojatixog.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3dccd9c1---dinebakumif.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/83499335629.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/domosar.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zusivekujifupase.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/61850134335.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/88779884667.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/40556386488.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144050de0585---5203892089.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/wazokolopiwikuverakule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ant1+web+tv+androidPDF link annotation
    • 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 10352 bytes
SHA-256: 2392a0bf0879c20b665b0db2779d171fcee91e69f84f116fd39d0a5d2b9f1c71
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 15952 bytes
SHA-256: bce55ec228632c34677e2d701ba03acf79067d9e288ace82fe909b9ee5cf4fc9
font_02_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1