Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f98eb8139d1bd57…

MALICIOUS

PDF

82.6 KB Created: 2021-05-14 10:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6e422aadd81e4fdae514721133f14a9e SHA-1: 728900274e53b54e2ce7d319520a72b11242902c SHA-256: 9f98eb8139d1bd577d89f2db7d6b0b64e1732f74a30018faed1f42cd1c250a71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9995

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 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.
  • 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://resalured.ru/strik?utm_term=union+plumber+wages+bc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369522/normal_605ada37cd3a7.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/5eda5a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_605a4d1c6e16e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60446d49ce58e.pdfIn PDF document text
    • https://cdn.sqhk.co/puburasar/uibiwhe/baixar_app_cabify_motorista.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/2309153.pdfIn PDF document text
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/32dfcb1b64.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/bonesogasuw.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/chgifid/17374754429.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/4652515.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/jixapud.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/Gyjgigi/dategudavukorepuregila.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/525101.pdfIn PDF document text
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/miwura.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/dubetix.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/zodawanuror/american_english_speaking_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/2017_ford_mustang_for_sale_san_antonio.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/cuentos_cortos_en_ingles_de_terror.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_2d85b15c5fce412283e940013a86039f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/27959434695.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/jekikatosewojaw.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_db0511f3ee064044afd5b92fd3756853.pdf?index=trueIn 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
    • 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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 5476 bytes
SHA-256: 3cdbd3b18fe757a50cc0145d1421eb306c36c2ea625059825430f53c945425bd
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11464 bytes
SHA-256: f6b85f199e7e433e267c70b1f73fae99dfee877942cd0186816e0bc17d09fb6d
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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