Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8e31c52baf17d4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 14:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9407b34a235b5de2548351f69f507b88 SHA-1: 1e2b6e2de73244e94209bbe9dc3f7349a1a7b64d SHA-256: 3d8e31c52baf17d4c496f0549f1be780e350100e4e9794f65325a21d307bb854
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host numerous PDFs on disposable domains, likely for phishing or distributing further malicious content. The ML classifier and ClamAV detection confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tsutae-f.com/js/upload/files/levazawejufoteredanipus.pdf In PDF document text
    • http://stl-hk.net/userfiles/xabinawudegekibib.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/22217595382.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/31145404698.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/25108676744.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/19875463276.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/36903078446.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/potide.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/xufosaxurewav.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/tujerisumuto.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/xozisokudiwidi.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/vewagolenowazozazaz.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/32196732010.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/mojuterumedo.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/rifitosefubegiwonorafiba.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/velunexukoxixaxuvid.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/24770946946.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/4669442271.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jizomajitejiwudafuda.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/47479266802.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a5ba173a---tovodexigolowetesososadu.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/menokijisanuxamet.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/67349930247.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/2392762499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bliss+valentine%27s+day+in+jail+watch+onlinePDF 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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 10848 bytes
SHA-256: eee0a506c13864715abd845bb1203c38eaa2f7ff7494967f3589b6682204d5f7
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 16304 bytes
SHA-256: f97330dc55d4f6e395cde44eaebcc57af679af3dc5a013f6934df32b91004876
font_02_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1