Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25b43384f7fec4b…

MALICIOUS

PDF

74.9 KB Created: 2021-02-19 18:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 44a07590266a950258f56fdfc2474606 SHA-1: eaa88606324d874e3ed6413315881448a1cc56cd SHA-256: a25b43384f7fec4b5b4d858cdd290d3fb5fb5a3b7b76b1ce0c554ff580ee35ba
126 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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/strik?utm_term=best+penny+stocks+to+buy+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5ff775b6da2a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5fd06c8b22821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fc87a7df1554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_601a52601ad67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5feaf886d3db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463006/normal_5fe1882a3d800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_600d96bc91bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_602ebc6182013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5ff46dea6e7d7.pdfIn PDF document text
    • http://xoxejun.iblogger.org/vuwiditu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fe9e5a9a60c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6017bb7fa3b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fe37443abf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd3aa1150c77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/bitmapfactory._decoderesource_xamarin_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/totugilolapevovido.pdfIn PDF document text
    • http://dufakukin.rf.gd/can_you_alexa_app_on_computer.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/bob_loveless_knife_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/marvel_avengers_gameplay.pdfIn PDF document text
    • http://rupijelovugibiz.rf.gd/tujolotegizutav.pdfIn PDF document text
    • http://gobipubefosoja.epizy.com/72190698750.pdfIn PDF document text
    • http://nosikugabuvisal.epizy.com/38408928886.pdfIn PDF document text
    • http://jopavufugas.epizy.com/rokoginejefitonupa.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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 4976 bytes
SHA-256: 856ac8b876c748e20f5b37133590e5ca6e061c3483b29a521b1dda7e73879e3d
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 10660 bytes
SHA-256: b262d8b435448d642a4cd76c4371e54afd59c0e1045a35e75de93fd85400c0c3

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