Malicious PDF — malware analysis report

Static analysis result for SHA-256 768359f47c0671b0…

MALICIOUS

PDF

81.5 KB Created: 2020-11-23 04:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b5b4752fdfad84823f4ec40d617d5910 SHA-1: 91b4c9b5c36540096a89b7391bbe886c754a3ecd SHA-256: 768359f47c0671b081ae9700716c70930f99ed5607f35494a9dfebcb802c6280
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 0.9998

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://traffset.ru/123?utm_term=365+dni+movie+online+free+watch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f9457f50f628.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/lotemowupalemiwozud.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/99859e3b918a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fac196570e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_5fadab9f8ad21.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/239ea139ac73931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8a07e3483a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a24afcc-2422-4e7d-a027-fea2f207596d/98295698163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761189d0-3aa8-4dae-bfc5-2c91f1248bc7/ranger_guide_black_desert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75519e78-4ea9-401a-b910-b862ef342927/xorisunoxomipozot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735863b1-226d-475c-855c-0f5ba7e091e1/sis_school_home_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66484bfb-f81f-4f9c-abba-e50306e71a16/state_workforce_agency_swa_prevailing_wage_determination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939556a0-b942-4aaf-a2bf-c3df0ae956fc/debiroleraxasozesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fc4d2b-4c1d-48fd-bf11-57d1402d1d09/girijuxunezuxebuwap.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_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 5584 bytes
SHA-256: 11f7f21ff81f7a04befafec099f5daf286206b0e868419bfad268ce440c7753c
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 10552 bytes
SHA-256: 551789ea92e014664c8b8097157fb8a6d6ccc5738370778550c180f318d44a0a

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