Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eed8066d3f3f74…

MALICIOUS

PDF

70.3 KB Created: 2021-02-16 21:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f732f59a387561360c0df779387be76c SHA-1: e15619ee71b3345698f3c832e3d82043e0587ead SHA-256: 16eed8066d3f3f745d7b40d764f904fe207e561a7649389ccb66e5853520086f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO spamming attempt. The primary URL, 'https://jacksth.ru/wix?keyword=bingo+stars+no+deposit+bonus', is presented as a lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, indicating a phishing or malicious content delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=bingo+stars+no+deposit+bonus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485926/normal_6015b777580f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5fec1685951dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_60137bfee88d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5fe784b47eded.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/pebemoratufazaviseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482208/normal_5fe50af180133.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/bTFjjdK/2941408443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_60192c832b386.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/4QjclIV/pifaluburedor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5ff1911aded12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381091/normal_5fed5ece83dbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonunetenigido.epizy.com/gepegemomutev.pdfIn PDF document text
    • http://gadivedu.rf.gd/39800247668.pdfIn PDF document text
    • http://bivuraxut.rf.gd/fezulaguta.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 5284 bytes
SHA-256: dc33498102204f89b8a1a54ca9bbdcafeeb6231621383a9cf0513ed6c0ec3fea
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 10252 bytes
SHA-256: bd4127ab583e1d5a0fccabc6c24f10e4d94decad2fe0cfe8d8d7b9380ce119fc

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