Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1d8e2fb58b8af…

MALICIOUS

PDF

70.0 KB Created: 2020-12-28 16:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ffc5e965f5614af26498d41ca96de13 SHA-1: 8f7e8e4d2b6c9e87569210609343d1c6f66a266f SHA-256: a5f1d8e2fb58b8af549fd6183221a8372d305d89925cb0741d426a4ffa5979e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=hypixel+smash+heroes+wiki PDF link annotation
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/2806372.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/voxodob.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/pedaledizilado.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/pedopo-xosakobazob.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/lidakik-nuzefa-guzele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fbf0a00b098c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_5fbdfe4f9602e.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/2d119ae9-bb7e-4da3-b053-01f95102af65/zamurajus.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/gupukobixolobivajumotiza.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/all_anticonformista_significato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32806b9-c74b-4fe0-bd7e-c4b723cfe15a/terraria_ankh_charm.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/christmas_in_brazil.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/data_obb_avatar_musik_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/85387799587.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/ruxutetutabu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/62430000271.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 5344 bytes
SHA-256: 661d14e011a00fa1c8410aa54e8c5e1d7926a316a62fd5074a9d1fdf78d840bb
font_01_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10260 bytes
SHA-256: 9f0a6c88de4a3ec232f5ecc331bfb08e0014ca3b5ebfafa7e306622627380a38

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