Malicious PDF — malware analysis report

Static analysis result for SHA-256 614f344196e02c94…

MALICIOUS

PDF

45.5 KB Created: 2020-11-08 14:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: adee5453a82704f59e6adb8faacfc5f7 SHA-1: b5200bdfdd63ace7e77ab5c1aee2c269099dfb9e SHA-256: 614f344196e02c94b2b50061f6b5d1ec8596f63d751bfd2e323b21b270861925
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like WordPress and Strikingly, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?keyword=boys+over+flowers+yi+jung+real+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f880f286da6f.pdfIn PDF document text
    • https://xazatawivofudod.weebly.com/uploads/1/3/4/3/134313500/123129.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/nemigewo_dixegoz_zapir_fofudavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f96b89f9a1fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nerewep.files.wordpress.com/2020/11/lugodapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd42d7b3-4624-48bf-96e0-1f477cdd9fef/76532254261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9689f53-898f-41cf-a55d-f255576d745b/los_voceros_de_cristo_descargar.pdfIn PDF document text
    • https://fugafina938553339.files.wordpress.com/2020/11/bolekunekokapul.pdfIn PDF document text
    • https://fakozuxi.files.wordpress.com/2020/11/lidalaker.pdfIn PDF document text
    • https://vasedaroxito.files.wordpress.com/2020/11/43559079740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c40dcc7-366f-4d2b-a7b2-813225014334/vejodagesomojoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/95504805894.pdfIn PDF document text
    • https://dijoxumo.files.wordpress.com/2020/11/66531286425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85aee41d-8a1c-4170-8a88-3f792ef3fd22/livro_entende_o_que_ls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d8d4e0-7b61-41e7-9e7a-6a26e6c668b4/ffxiv_hallowed_ground.pdfIn PDF document text
    • https://xoxitefig.files.wordpress.com/2020/11/bertie_botts_flavor_guide.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_off00007306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 5464 bytes
SHA-256: 5d7cebe94aee791e929ff5ef4a1687beecabcb5a8878bf3fcf531078fc4f472b
font_01_sfnt_off000085b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 10360 bytes
SHA-256: 348f97e50f39238840a9ced344d0fc4cfb38cd4183b79efbb1331315c2050db1

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