Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ee6b8ef4ece78f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-10 02:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef90aa7e727f92df9ff4abf72e62ed59 SHA-1: 9172918d25d82b758f5aead479c85edfb8e7ea3c SHA-256: 33ee6b8ef4ece78ffaff8246452857f09054cfdf9e17e74494e16b953d7c8c68
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 0.9998

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://wastran.ru/pbw?utm_term=roblox+infinite+robux+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408172/normal_603d8e69a8f38.pdfIn PDF document text
    • https://batovidurasitoz.weebly.com/uploads/1/3/4/3/134340050/lovunigudidukanudo.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/volotikaratumom-zapiwoxozo-pupigetij-regikutibowix.pdfIn PDF document text
    • https://dexutafabo.weebly.com/uploads/1/3/1/4/131453723/2006077.pdfIn PDF document text
    • https://xekelubapakam.weebly.com/uploads/1/3/4/4/134499273/d2500b002442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fd26530afc23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60300e4f18e03.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/8a56f1.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/5546646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenivuzuk.pbworks.com/w/file/fetch/144918126/the_great_alone_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2cc49c-aabe-4aa7-9eeb-4b8fbbf53445/nipum.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/61307469249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a3cc36-6691-42e9-bb3f-feec8c41019a/turedovoniku.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144444621/how_to_start_a_meat_shop_business_in_the_philippines.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/9408441218.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/4698122873.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/f/tugiwe.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144520542/43265897424.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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5032 bytes
SHA-256: 64288170f5deb36bb434e318aa07f1549bba9c1f9c38519bf89180c19a0792c1
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 9708 bytes
SHA-256: 37058342fe0cd78bcf974b8ff79f0679a57bf2d28a3de437515c7d8733178478

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