Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b94734c52072724…

MALICIOUS

PDF

72.2 KB Created: 2021-05-25 04:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7cb62814b170e29af133d3f3807496f5 SHA-1: 5b3e734e2a74e00e134c38fac3e71a0e9ec5173b SHA-256: 4b94734c52072724f2ef054f6a5b260ef9f11dd7ec389ffd538a55e62725c87e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=why+is+c6h6+nonpolar PDF link annotation
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/kugeponiro-jenapeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fe094b307ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_603329b378d43.pdfIn PDF document text
    • https://dupafubakatato.weebly.com/uploads/1/3/5/9/135961249/4e197cef05963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_606b16d2989ce.pdfIn PDF document text
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/romuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5fdeaf6c1d87d.pdfIn PDF document text
    • https://mapazudisobamun.weebly.com/uploads/1/3/4/6/134604154/goros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_606db2f69b271.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/pifibexuvaluwor_rakonuxov.pdfIn PDF document text
    • https://mewatejo.weebly.com/uploads/1/3/5/3/135322937/9515826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_606947ea6a05d.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/powewot-barubevamowujow-jabokusupeg.pdfIn PDF document text
    • https://tegikokawotivax.weebly.com/uploads/1/3/4/7/134759165/7015933.pdfIn PDF document text
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/46b224b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fed4f992e55b.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/gewisetug/jozakixomejadupoj.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/chrome_windows_8._1.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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 5288 bytes
SHA-256: e81f7800a8fa8d43ab99055b80dcc47db0e8d47bc13153bfc805734f6f12357c
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 10836 bytes
SHA-256: d002e1bcb8b9c39e4e620eafce4df0e5eb9753d7f7a74b227a1e14d49ace8359

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