Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7d410c47aec160…

MALICIOUS

PDF

110.5 KB Created: 2021-05-28 18:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04dc1ac550a4cc8411bafa3a89404bff SHA-1: ee85ec4ef60e80bfbaa816cdd4ebc0f8ce960abd SHA-256: 9a7d410c47aec1601efc8c08fbf163a94b62b0d9daafdd20abb321fc1dcb37be
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing or scamming intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/123?utm_term=vcaa+examiners+report+english+2017
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/24afb9e7e9.pdf
    • https://cdn-cms.f-static.net/uploads/4493610/normal_603b32b185c81.pdf
    • https://lonopenofof.weebly.com/uploads/1/3/4/8/134895818/vuzupora.pdf
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5fdfeec1dcf18.pdf
    • https://tumegifokax.weebly.com/uploads/1/3/4/2/134235775/407de6db52c.pdf
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fce2b50a5af8.pdf
    • https://cdn-cms.f-static.net/uploads/4469358/normal_605640246099a.pdf
    • https://cdn-cms.f-static.net/uploads/4495391/normal_604d1d84f1c8f.pdf
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/97df68.pdf
    • https://cdn-cms.f-static.net/uploads/4457305/normal_604edf74a408d.pdf
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/38bcfd61bc2.pdf
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/kativitolitijexu.pdf
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/gekisateje-fojisat.pdf
    • https://falumegobe.weebly.com/uploads/1/3/4/7/134702986/kedewabumefafel.pdf
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/a6504.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_605f7d1827d3c.pdf
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/gavizezimazobivod.pdf
    • https://cdn-cms.f-static.net/uploads/4427091/normal_601be37bbb71b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165f5.bin
eada17f2070f6c79f6e770ec8b6a56f5c4d858db4ddeef9bde70212c83023e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165F5 5788 bytes
font_01_sfnt_off0001798a.bin
2afc97bf55bda7601225429bd70c913bcf466cf96261a87d56d443894e249237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1798A 3052 bytes
font_02_sfnt_off00018635.bin
b493fb198f01f707ae54dae4c7169d4b8146ad80a88f09af366aaad0a7e7b0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18635 11196 bytes

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