Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44dd8d97d2e3a0d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 08:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14c18953c26fedc518c31fbdfa27d6e8 SHA-1: 6c90a4d20da5c5eabc0a74f1cb9e189c5e2ac2ee SHA-256: d44dd8d97d2e3a0db4a19696698fff331a1f29848bc7e7aa3f96a188d3b961eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true destination by using many distinct, low-link-count domains. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/32944898664.pdf In PDF document text
    • http://edbiji.com/uploads/files/20210902060846_127332.pdfIn PDF document text
    • https://km2804.com/ckupload/files/birojogex.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/rekorezanefekogexari.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xodamoke.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/62226124150.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/6300098133.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/nulowudegivurifefo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/46210000975.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sajufovadoduji.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7cf243c04e90af3b55e33db4ebec721e/45742389160.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/400284749.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kemagukiwebonop.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/kilanesiluvofuparo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/68594065231.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ravexikoju.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/tirarogiketurof.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dozoposobunowiwokuzepem.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m4509i0al0ppj8m90gl7uaqgds/dikixabisigukike.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/lotaxifen.pdfIn PDF document text
    • http://grimastone.ru/files/tidedizevagexofekaduwi.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zerijizakegujid.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zasisevosanodenoxamafube.pdfIn PDF document text
    • https://actorconseil.com/files/file/99119810381.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/30923797297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=killers+of+the+flower+moon+book+pdf+free+downloadPDF 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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 18252 bytes
SHA-256: 772fd719e74532e9dc72a0bb3c2af7491e0d6ccfd915eef7303683e6f209db98
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 11072 bytes
SHA-256: 32b5d7cb1d3934884d2a6f4d4dddcd1da008089a4d3f3507ca11959ca735194f
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1