Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8f57acbb9f62a4…

MALICIOUS

PDF

42.7 KB Created: 2020-11-06 20:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 324f94aa94034df0cb6ca01d1e0c4008 SHA-1: b8ac07a01c978d0f36087d64cc431745d17ae31e SHA-256: 9c8f57acbb9f62a47b5fe0e2ea35f62022a70245438ccc3b99323f5a1d9454d1
66 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 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 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?keyword=examples+of+concert+report PDF link annotation
    • https://metufudosajaf.weebly.com/uploads/1/3/4/0/134012305/9f039a1a2e0.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/6338fa2.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/pilukane_vegezefuromi_pawonurat_puxopudofifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f9323a75e679.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/xebuvuwov/house_altar_depicting_akhenaten_nefertiti_and_three_of_their_daughters.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/wovobolula.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/wenidemikefigika.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/jobixidebokeboribodu.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/40570891273.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/gopif.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_off000068cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 5184 bytes
SHA-256: 4c4ebb5a8cf4e1254d325aff74f313a21f2c20570a26ca8689d5d6226743b152
font_01_sfnt_off00007a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A66 10568 bytes
SHA-256: b479c3366761abedec17e353d216e0d6711879a5ae08c716372ddca99f8ad18f

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