Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fe42456e13cab6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c165637a802beac8f10dac5a6ff7994e SHA-1: d33cdf6dc71b3e8fda5d193bb96cccd71bca5c4c SHA-256: f3fe42456e13cab66310490f8d64965dbcedbc3e576bf7851ea591d9cd570b28
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ayurveda-shiatsu-nice.com/upload/files/seletofasuvan.pdf In PDF document text
    • http://konferencii.org/web/uploads/assets/file/34469564840.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/dovusezifoxosovad.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c488d309---kiwakofanoku.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xeguvagod.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/jokanurowirelub.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/votunimeruvivubakujadus.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/gawegenigidokapoliwo.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/degopobogetefisodijuga.pdfIn PDF document text
    • http://elitacasa.it/images/file/lisawivisuzigaf.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/koxifamifikozefa.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/zejuxovaridixusuzuj.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16610955024.pdfIn PDF document text
    • http://vaithun.net/upload/files/13726818255.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/74683095471.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/85256066481.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/57941140072.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73449183584.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/23629270483.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/pavoxuguvab.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumulekupagekiso.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6b84d79955f558bf5a1baabe092524c/98437099313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=electromagnetic+waves+frequency+and+wavelengthPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/3080655192.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 11416 bytes
SHA-256: 0d81ec4217503c7f5ae72f19c815d28671f12195f83238a58cd575ef91e39173
font_01_sfnt_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 15384 bytes
SHA-256: 53243b579cd71ee368186c2613159df0591b2babb245b65e5a3497a2a90115ef
font_02_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1