Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f503239733946f4…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 06:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 832b80d9c3edd7c0b0161f4a0da6da1a SHA-1: 52f0c5307f8e9f69e07a27916e07a676802e6a70 SHA-256: 1f503239733946f422f9b2cbac39ee95c0f277bbf57a18c8f3e47e3fdc07accc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, presented as a 'link farm', with the primary lure being 'behold a pale horse pdf download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=behold+a+pale+horse+pdf+download PDF link annotation
    • https://selubigal.weebly.com/uploads/1/3/4/5/134518702/1488feaadec1b01.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/gamina.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/71335879067.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/04317b4d.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/kotter_1995._leading_change_why_transformation_efforts_fail._harvard_business_review.pdfIn PDF document text
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/8702439.pdfIn PDF document text
    • http://wobokegidutijem.iblogger.org/97180866159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwodiruvukima.epizy.com/technique_pisciculture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c862f43-4448-4162-86cb-5975a618849b/194143529.pdfIn PDF document text
    • http://bupagaruwizuzu.epizy.com/37630058664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40098e4-4a02-438c-8e69-0ec8c31bdaa4/revunemozom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28e609d-4f87-401a-938e-8c2438a09c4c/4821471437.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/zosoxisixozo.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/42734604003.pdfIn PDF document text
    • http://bozojugejev.epizy.com/96476493438.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/8051899353.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/23018371091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4fa388-11a5-4c78-8329-6c7fb6b65471/ejercicios_de_porcentajes_resueltos_septimo_bsico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7c1438-8d1a-4df7-a077-44e3052c361f/who_invented_sexuality_spectrum.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/hip_hop_hits_2020_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafe27fe-0237-4617-9387-4c601b4799f1/87826777514.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 5268 bytes
SHA-256: c22ba18335b6125e56ed0dc5a353b8d0a70f58a9165d4a7664525e6b759e8b13
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 11016 bytes
SHA-256: a6e8bcea6facd1ca75e8d1587898c0bb34ec5039055159f29e619e0133fbbc33

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