Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e366d80cbe28ee…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 02:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2007965ba7bab6a8f7540aa8cecc2d8d SHA-1: d36b7efc4e26dc50ab8dbe67bb4387d27490dc4b SHA-256: f0e366d80cbe28ee4ffca6d6ffd32603571201ad443fd56b4a552ae7172799df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. No scripts were extracted, but the presence of many external links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=how+to+know+your+phone+ip PDF link annotation
    • http://chandravanshi.com/userfiles/file/vubuzigonetodizamoki.pdfIn PDF document text
    • http://rld-carbon.com/file/bozumufe.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/15321835163.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/vifowabazugenibutidaj.pdfIn PDF document text
    • http://air-ned.com/uploads/files/pixedodasoxogili.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/rebusitufisexubuwavumi.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/wakig.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/17426171564.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j4ts29bo2egqegmqu32gkntuqf/terulunixawirewin.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/paduseponifijanegupigov.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/30691738063.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/duxofoseson.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/95477655474.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/libobunenirivukaz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e27f0afe1c---71033179760.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/34296583684.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0663535001633020882.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/jodavivaxesa.pdfIn PDF document text
    • http://serting.eu/userfiles/files/4040101874.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/juxizukegusogufagusadeba.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/dovidijukuziwij.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/74007992398.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zunerunisapiga.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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 18028 bytes
SHA-256: c467dd919bf6a1d90607f9baaf7c3edb5fec6963a695404f7d3796183ea1b6da
font_01_sfnt_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10356 bytes
SHA-256: fbf5de234a97c834c392d961075f28ea30d255e8cfacb46a5fce98463276a5c2

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