Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3c6e7b0385c1a4…

MALICIOUS

PDF

33.8 KB Created: 2020-11-09 03:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 46649fe88eb75f217a52a6ed6ab7607c SHA-1: 23b64d93fa4dd77a4649e6d9b1ecd19f6d10f683 SHA-256: fa3c6e7b0385c1a407b2b608b093919ca504674445ab2a11b3de55651b9207c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDFs hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the nature of the link farm suggests it could be used to distribute further malicious content or lead users to phishing sites.

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://trafffi.ru/123?keyword=frontosa+fish+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5fa16ccfa7fab.pdfIn PDF document text
    • https://tafogufuju.weebly.com/uploads/1/3/4/6/134638326/polata_disuke_zomodipexowibo_jiditesekimatu.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/xemil.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/a3b8a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fa77ff08c504.pdfIn PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/dibidijozulax.pdfIn PDF document text
    • https://memesuxiti.weebly.com/uploads/1/3/4/6/134635319/dimijebomenanutuf.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/6fec1faa3535.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/pivujuzobezo_mogisel_xolopofika.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/44cf700a-408b-47a3-b18d-e6752648717f/79807797079.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_off00004915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4915 4812 bytes
SHA-256: 9b07a15b917a6187fdd310b7d120e974a1eaed2af70c033367182d44d401abf5
font_01_sfnt_off00005969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5969 9932 bytes
SHA-256: 57c9a5f8150dbfe910f895ae1266e4629a4edd4d8f61de60592d75860014d335

Open this report in the interactive analyzer, or submit your own file for analysis.