Malicious PDF — malware analysis report

Static analysis result for SHA-256 5867a24759c36609…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c714adc67edb80e878b1736e196db33f SHA-1: 78ef1d12e9705eb5dcb9bcaa68cdf860224d52f6 SHA-256: 5867a24759c366099ec9d3d4de4e571ac7b922c60bb75d76a003ab9a99c92a09
186 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, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=example+meal+plan PDF link annotation
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/kemofiremuzuma.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/degewirinifu_nesemazajelame_befolim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_5fda135d6e862.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/denogivexoz.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/11306247390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_6029350f9b27c.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/effective_communication_in_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_60181c539f917.pdfIn PDF document text
    • http://bufo.online/what_is_metabolic_process_of_wine_makingluikz.pdfIn PDF document text
    • https://balusapox.weebly.com/uploads/1/3/1/3/131380564/lipipusowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fe72389efc17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_6008dfa4d74fc.pdfIn PDF document text
    • https://kugatovobubusub.weebly.com/uploads/1/3/4/6/134680339/ecdf58641b.pdfIn PDF document text
    • http://detonic-romania.website/69371877088me9i3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_b0f26d01d0bb4f7d8408d8e0224fb793.pdf?index=trueIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_7db5530fe42f4bc3bb96322a3ee0ec44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d8bf5c-28ff-4c0f-be73-3b53f4856aa6/food_safety_auditor_salary_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6141fc70-2931-423a-a830-c34141a859fa/what_is_the_role_of_church_trustees.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 4716 bytes
SHA-256: c4f0da9d44bc74cedefceb9a63dea1677de43081a1ea56b449f0325f597e5f8c
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11256 bytes
SHA-256: de30c1d32dcce4ed7a515a9c2303b101a7e839eae69ce43d0df61864cea0e171

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