Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93d30269c14550…

MALICIOUS

PDF

62.6 KB Created: 2020-11-18 12:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f3593825f6d68b98ebea717755f1c810 SHA-1: 2e1f9aeb67fcf0c5c7c51edd2320da5728374a3d SHA-256: ef93d30269c1455057e39829bfec6b50442617a091afe3e7e457bced434cbc1b
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=holt+of+california PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fb27b2bb2ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f90734c751bf.pdfIn PDF document text
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/rilinubexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f998a2296722.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/poxigorujuxo-gurubirulakit-nujut.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/6659646.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/legapatatezisa/slide_for_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/9623887609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f30a6b-984c-418d-b637-11af220831e6/22292561845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ceefec-d8bf-4710-b303-413c5820c66c/allah_de_tesini_brak_kitab_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/software_manual_testing_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/tagemejedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e91cff2-8ed0-45d1-8728-d9d27dcaf57d/zivanisujek.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_off0000b7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FF 4656 bytes
SHA-256: d2d70235181a66ab5194640cb308f5a80e233a576c7b256d4b5a191b59fec142
font_01_sfnt_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10952 bytes
SHA-256: 046cfdf91b833ddaa4def80a4b8b4b42f0fdc32ce35798ae49c4685cf7e66d73

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