Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5489cbb3a8daefe…

MALICIOUS

PDF

94.7 KB Created: 2021-05-26 16:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 93580dced9e72146656356b56b4ece17 SHA-1: 07c7302313ad3346d59571896e06a5fcb93b3869 SHA-256: b5489cbb3a8daefec6a0ed33853b0bf7940d7afbd16b53d8ed2689741bf10259
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs are used to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=verizon+fios+router+g3100+vs+g1100 PDF link annotation
    • https://xikewipevugid.weebly.com/uploads/1/3/1/3/131383679/gajikav_sowufi_wosovijonenabod_todixev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fe748d3cebf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_602174de8ea1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5ff76b808eb62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fdad1cb097d9.pdfIn PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/5608524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5fcd6e0d25fa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5fecf7adeb244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5ffa8cd7268dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_601ed13845143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_5fe94a4d4a4f6.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/zuwegugirejoxunoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5ffa7e5dbf83c.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/5851191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ff54a8ef4087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_601e543a8fca8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5ff8ad68d0a78.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 3796 bytes
SHA-256: 7311f627b75dcb1e95609064edaf7edc0930f623d4975111045c7639f2968ab9
font_01_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 5124 bytes
SHA-256: 3c9be966d92c6c96eef3463741c1223dfcd27028d3e9cc39582bb829ca8a6c14
font_02_sfnt_off0001439e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439E 11760 bytes
SHA-256: 52dd6b55043523fc907839f205229c054956b77da08b43e5111f1000abfbcba1

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