Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef2667cc6e57eb0…

MALICIOUS

PDF

84.9 KB Created: 2020-12-15 04:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c77b7917de0996b6fc2cb5745f9ac94b SHA-1: 626369efa795549d5d41a34a389a68770c5a5cd8 SHA-256: 8ef2667cc6e57eb08945fafc21484b4bf8959e001b20e456d4d4d330e64f7d3b
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 0.9991

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=descargar+hatsune+miku+ievan+polkka+mp3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5fc4d2c7eb0b0.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/3570015.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/86925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f935cc089d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8778fab7581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc525ff8139af037660b63c/t/5fca90e6df388c3a04be5342/1607110890118/blank_swot_analysis_template_powerpoint.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e8ef2bbd740658068d75/t/5fc901a75452ea045f653dc8/1607008683494/world_cup_qualifiers_concacaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00570a3bf4b14aba44e61/t/5fd184ca880fa23343cc26bd/1607566542611/5911510460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7daaff5f-d7b1-48fb-b10b-d4c6f9240082/32731507768.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/lonojivedasivoxedavesuxon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd29422c57a03dcb376ad5/1606232388715/lafalo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 6676 bytes
SHA-256: 73539583c34474f2ee939104b46720bb81c6798b6c66b67194b6d150af431f3d
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 3960 bytes
SHA-256: ead4af47a088b0d20ff8b1b56c4fece11e30c3d9e87388d1ac23276190c0b720
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5636 bytes
SHA-256: aaf9285e455e018b3fd01c3221de144dbe263474a6fc0c514fb49aebc12f9bb6
font_03_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 11672 bytes
SHA-256: cc26bc3ef55e1ed08d37016ea51911f0318cdaf696da56b959185548cd81b528
font_04_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 17264 bytes
SHA-256: 67a8a28668852adcb899fdef4489f1e03813e55b6408b9580a86741fca896000

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