Malicious PDF — malware analysis report

Static analysis result for SHA-256 133ad3f69a6487dc…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 16:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c85858acf46f04228e5c4181c3377400 SHA-1: d70351fa58cc79a233a25b8649a501809f21e004 SHA-256: 133ad3f69a6487dc2cb213ca546573aa093d8833a5ca4a1b60ac3e375aff1f25
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs that redirect to disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the nature of the URLs suggest an attempt to direct users to potentially harmful content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=ap+environmental+science+module+answers PDF link annotation
    • http://repair-telefonov.ru/zopilu60pti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5fd272c4f303d.pdfIn PDF document text
    • http://keepqifi.site/fesexibuxuzozabumovaraze3e8n1.pdfIn PDF document text
    • http://uose.xyz/lugizuvum7yt1i.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/270322014661yb57.pdfIn PDF document text
    • http://frut-tree.site/lekamulewagunikadowasone28sz6.pdfIn PDF document text
    • http://ujjjrrrrr.space/financial_statement_analysis_valuation_5ecyvmo.pdfIn PDF document text
    • http://study-english-05.site/kaduwucio2y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_60414dcc9ba49.pdfIn PDF document text
    • http://afracheat7.xyz/suwutadijajagoculm0.pdfIn PDF document text
    • http://ig-copyrightviolation.com/89665273686thopu.pdfIn PDF document text
    • http://dvigatel.guru/befotadovebikugebipah0fc.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/3ae2a24e-b977-4950-b346-8d6fa59b2fca/rigadamakufivi.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/black_image_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/numerologia_cabalistica_ultima_fronteira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfec3f24-ec15-4475-a3dd-c06f1ab64223/43779974939.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_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 5360 bytes
SHA-256: 62b60288397955eff6821dfc64b1d409e770f5d6d9d21d321a57928735196bfe
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 11220 bytes
SHA-256: ffe84d7ed2fb2083af2d6a408a168313f21159c17acadafbc6551db73f4ee5f6

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