Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff1b3ebebb14aeb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 21:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30dd2020d93fadcea6e170d78c081f40 SHA-1: 2beb759c76449bb36daf6c18dfedaea7fc12950e SHA-256: 5ff1b3ebebb14aeb73ace6672ddb0424338fee1f1601b5a57e26cde5dc6055f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of hosting malicious content on numerous disposable domains. No scripts were extracted, but the overall structure suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fotografski-studio.kost.si/userfiles/file/5255596330.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/26293595992.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/46727501293.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142284ba1e6e---12338129915.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/doxosozikosesijina.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/94760100087.pdfIn PDF document text
    • http://yilip.net/userData/board/file/39373104775.pdfIn PDF document text
    • https://webhosting4.net/media/file/kijuziretomudoxubo.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/sibavotusegalukewetemu.pdfIn PDF document text
    • https://jotelek.hu/files/file/purebozinef.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/30227449239.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68260218688.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/gapixujozezu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skqgio1l5003beurp9dr1jr5o8/bimajeso.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/naletapufel.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/turedamexijosefaweb.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/xexufukuredezez.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98840102953.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/74315025974.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/safonosibomowogotaluz.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/beguzikodularuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=my+msn+sign+inPDF 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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 17708 bytes
SHA-256: 616b34ee5200c6aaadd076bb7d0e9948edc0ea09055b7c3a61616957d7a2766e
font_01_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 9900 bytes
SHA-256: 1a4348754fdf90fb5896b1f11c0890967ea698a218cf37f002b208e55d50217d

Open this report in the interactive analyzer, or submit your own file for analysis.