Malicious PDF — malware analysis report

Static analysis result for SHA-256 970919b84a75d9b7…

MALICIOUS

PDF

91.7 KB Created: 2021-04-25 01:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7210daff04dae9842dc4855c7caeaeb9 SHA-1: 56976f132ba6eb10bc457f690db6545c4f739140 SHA-256: 970919b84a75d9b7561ad93609e74c45d3104042b857e225a828683ff6605b7b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on disposable domains, a technique often used for SEO spam or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=walking+disaster+jamie+mcguire+vk PDF link annotation
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/jujeturad.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jeUibhf/lebofalujuriziwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60219d6c06773.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/kamowupinonepi.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/hhjcrd1/ruwovelisopogikizor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_604d1e101927e.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/27548232988.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/pulotuxokamelal.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/hhjggha/jawumefojemi.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/6ac9a441bcf859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_600832b295638.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/ihjhaii/london_muscle_bulking_guide.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/boxudukamedapuwogeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fdbdb0c7eedf.pdfIn PDF document text
    • https://bisutofudumi.weebly.com/uploads/1/3/4/6/134663563/baaef0162446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_60634bf8e50e4.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/JVgjifk/slot_cars_racing.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/1825130562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://domuromu.atwebpages.com/lodelodakepiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 5244 bytes
SHA-256: 95d5d61531ec1a425d081100aa987df7dc88c01924f094b7482f257234ae0215
font_01_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 10924 bytes
SHA-256: de49e2cdef1d8909ac6f96ec22cc57cd3b5a3281d5e65cdc85b6705b3ed90717
font_02_sfnt_off0001539a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3