Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61b09151ffb82af…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 07:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c14189f17c2fcb129c3974e8bc7fbf9 SHA-1: 145269860fc64a1cb4b1af10a59ac2b5f9a73b4c SHA-256: c61b09151ffb82af6564a888ce7f2c49827245bc2823d59b6d18938f764505b7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • 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://nordiskvillaventilation.dk/userfiles/file/sunebefevawidexupunes.pdf In PDF document text
    • http://alumcity.ru/userfiles/file/7764490678.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/metuxupiwabavurazin.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/kijogogekimigefajixogak.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/jadowetuwikazizekixuxow.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/josazo.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/repalifupos.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/turijalevewafipepewurib.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134424b0815e---53291926837.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/26274953029.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/tovudowuseru.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/3960192325.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luxijipidevurudivesofim.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/82293966593.pdfIn PDF document text
    • https://rotitelor.com/contents/files/28000637157.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/28536024248.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/lagonaf.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/68259684983.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pobopuvamev.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tazilukemip.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/51873275849.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/buwasoxilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=components+of+job+satisfaction+pdfPDF 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_off0000aea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 15644 bytes
SHA-256: 05e16bf7225ecdd2f460895b20574202643c65aa371d4f01ab9b5969daf2841a
font_01_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10936 bytes
SHA-256: 8c55a3a69aa140755533ea67c48688271782c2f1fdd99668af78189efb6cf7d2
font_02_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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