Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8c8520bb82690…

MALICIOUS

PDF

95.7 KB Created: 2021-05-21 09:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e18bfbd72020d8e7656ac8bc9ba51788 SHA-1: d1ae53ae0e5e87b171807a61571de4a33218b327 SHA-256: 04b8c8520bb82690ae81ef2593089cf664997e02f2d3d5e0fa4475c4a7976094
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to resetting Samsung appliances, which is likely a lure to encourage users to click the embedded links. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=how+to+reset+samsung+ecobubble PDF link annotation
    • https://zajasonasijo.weebly.com/uploads/1/3/4/6/134627958/c50f6b1c093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_60304d2f47bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fff2a7c66911.pdfIn PDF document text
    • https://mizededul.weebly.com/uploads/1/3/4/0/134040812/4104075.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/dugududusalik.pdfIn PDF document text
    • https://bumudipokipilu.weebly.com/uploads/1/3/4/3/134350227/sazelan_gofubevez.pdfIn PDF document text
    • https://voganolov.weebly.com/uploads/1/3/4/3/134372868/nadaxuwulu.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/8787664.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/foralu.pdfIn PDF document text
    • https://binewetakug.weebly.com/uploads/1/3/5/3/135326509/227696.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/vaxulegazu_gomufow_ravozov_resojineliret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5fe7222c86cc2.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/82d61077b32d2.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/zuwawiwagelapa_kewese_bajuvavaluravo.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/cf6b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_604cbb016b6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_60510318df6cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603bf489431c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6029dcaa67b5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_5ff7563639d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5fd2dc6da8666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5ff50e3122302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_606c13d5108a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 5312 bytes
SHA-256: e543a30e758e28affaefb583122146d27479d22a98575760f7cdf7a6734e1c32
font_01_sfnt_off000148ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EF 11756 bytes
SHA-256: 72abe3da7ed104d089e118aa7881bc2a8ea6ab373beebe9fd28fdd35d4568230