Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55d5c40e37d5a8…

MALICIOUS

PDF

74.7 KB Created: 2021-10-10 04:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ec1bb4be87f4a661461373b2c3053b7d SHA-1: 47d5afcaa28b3bd79172151a0bd13984352ac045 SHA-256: 2a55d5c40e37d5a805116eeb9a1e8077a9b0782f0c70782dfd194d9db474f6a7
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 or trojan variant. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to direct users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=class+7+icse+geography+book PDF link annotation
    • http://metafelix.it/userfiles/files/zirugaxabopojiwuzix.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tifuguzefonisatife.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zoruribusijedavizozurip.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20211008_140958.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/19696893946.pdfIn PDF document text
    • http://boldogelet.hu/media/fakarufuzitalafikojaxeti.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/xilisosufutovu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f10af7747d---bepefezuvuvujitaj.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/sisetaxogofom.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/13167714662.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/talonadimukanat.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/vafakadas.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/19357049063.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109072325289005.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/34030322293.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/53296365488.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fp7s24prmrr1fol1nahtvk8l5v/golakolegibaremup.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/2017663080.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/44666867844.pdfIn PDF document text
    • http://www.bash.cl/media/file/zagukupewuxifutolidud.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/kitadudepiterike.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_off0000c08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 10880 bytes
SHA-256: 904f40631d46d5b4de3b455a7d3807e28904e2f1a7dff0a7c9415b06ee14fa4e
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 16900 bytes
SHA-256: 39c9c68c7342eabc85fe33e3fcf5aecaf022b04e09f08d49cd489c82cb0e36e3

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