Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ef1c590b06d6ed…

MALICIOUS

PDF

85.0 KB Created: 2021-03-13 12:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01720de942ec25597bb46b54bf44a331 SHA-1: 5d05d20a4db771db604d9419443632e0e6ab8ac9 SHA-256: 51ef1c590b06d6edb178d3378d7950192c9c105b5c0e5047874cc98622d064c5
196 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 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 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
  • 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://gimoguvi.ru/123?utm_term=representative+payee+report+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5fed14836ac92.pdfIn PDF document text
    • http://azorocheat6.xyz/zekadakipab1vvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6011c995dcb65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fee24c207bc8.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/103657.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/petej-jijoforozawi-nomix-raxatebalosimul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_603fe0c0da77b.pdfIn PDF document text
    • https://wimegipovuxu.weebly.com/uploads/1/3/4/3/134373819/4976395.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/arquitectura_bioclimatica_filetype.pdfIn PDF document text
    • http://copyrighytsupport.com/letters_from_christopher_watts_book2zm9e.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/what_does_cbt_do_for_ocd.pdfIn PDF document text
    • http://filanion.online/63550745252e6fc8.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/moduxanakuri/zoditaladibatiga.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/xomalexol.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/what_is_a_qa_specialist.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/curriculum_design_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/44782321357.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/google_chrome_update_free_filehippo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 5184 bytes
SHA-256: de415dde68279fe86a7aaba49ee34fd74c634b8163fef9999fd4b4168b6e6e40
font_01_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 10360 bytes
SHA-256: d4ce98de7fb4c7ac727aec45b6106fd0dcc0a6450ac87c2ee19f598040d873eb

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