Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2ab3ca48f3d402…

MALICIOUS

PDF

81.4 KB Created: 2021-06-07 00:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c6f24b088e4cd8150516ba8b185a0062 SHA-1: 57d706c67ef309ea6087d18c5dd4bcdcad29668b SHA-256: 2e2ab3ca48f3d402ca663b4ea7dce2d101cb53aaab2d6e32a8864fbb9c1fa4f0
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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
  • 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://maypoin.ru/123?utm_term=how+to+write+book+review+format+ppt PDF link annotation
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/xobugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_606e647e5398f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_60570e07afa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_60697c9627ca2.pdfIn PDF document text
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/3f5b9ba8b43880b.pdfIn PDF document text
    • https://surumisaw.weebly.com/uploads/1/3/4/7/134707241/furefal_rukobe.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/vemamipabe_jakirulan.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/274881.pdfIn PDF document text
    • https://maxugiveworupuf.weebly.com/uploads/1/3/7/5/137513679/11e888b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_603b3248ccaa5.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/dusedipibula.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/8140120afccb67b.pdfIn PDF document text
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/jebidip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144671889/communicating_about_health_athena_du_pre.pdfIn PDF document text
    • http://masawumel.pbworks.com/f/porufila.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144520884/nomonuvabesu.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_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 5152 bytes
SHA-256: 2c1866db320f1505ae7a4dff5a04ce91d26984e847b98a2bb38e9f4d3f6853f0
font_01_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10696 bytes
SHA-256: 0de8fa5c7565757f9a96456e19f38ff36980769ecac760b7726f05aa1fade507

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