Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d858f87b3c6108…

MALICIOUS

PDF

66.1 KB Created: 2020-12-23 15:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 272fe5b414232e89569cc6e39bfa1bc1 SHA-1: 507cd2cbabab4f337189655cd5f9fdbcd32a9901 SHA-256: 28d858f87b3c61083cd06db8f173e1ed5e06bae8a03ed1cdbcda7c77ea3b4d54
254 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ggtraff.ru/aws?utm_term=augmented+operator+advisor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fa90f5fe8bb7.pdfIn PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/5495016.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/b4d0be56fe138ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fa217622c80d.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fda8a5984f3b.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/6553632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8d6b9d95553.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/lisowid_xaxazu_puduzejasomirok_ruluru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/free_hosting_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/xatiro.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/ahri_cpd_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/75724222719.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/dragon_ball_z_android_saga_power_levels.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 5296 bytes
SHA-256: 745fc9de0492a9994f3537bad44be53c5937a8d98a2c328934ad0539f66d3b60
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 12936 bytes
SHA-256: 8a722db19ac802cb3125fd4221cbdd6924b65600915841ac5fde65a1abee30c0

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