Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4d5c8f175ba50e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 18:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6142947ed17b2fbf1a60262e7cb0def8 SHA-1: 11d1f9e45424e123d7b40bf2e875368aa572b3ba SHA-256: 8f4d5c8f175ba50ea098c39b59b84679c42d2cb8de0875b63b2609054c2a9aee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=real+estate+follow+up+letter+templates PDF link annotation
    • http://bumasujofoj.getenjoyment.net/77351494184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ffd281da0b44.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/70296.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/creative_writer_cv.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/derecho_romano_margadant_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fd7cbbef418a.pdfIn PDF document text
    • http://daimontimur.org/790467556409divq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6029497e00360.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/wefutorolajuzumakafopofik.pdfIn PDF document text
    • https://fizilotot.weebly.com/uploads/1/3/6/0/136050642/papumekudojoli_gibovuseju.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/17107205057.pdfIn PDF document text
    • http://dokumenty-kiev.online/zikunelosatazaf60o2v.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/faritubozo.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/3996517.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/perudu.pdfIn PDF document text
    • http://smotrikino.fun/ejercicios_futbol_7_alevines5f1rg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492246/normal_5ff87062c4f74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/8697619348.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_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 5148 bytes
SHA-256: ff02c9cac4af0f706c66c4af3031b8960a6ae3f3963165945b3d43b8d8bc8e51
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11064 bytes
SHA-256: 0c2da6eebb7ed1563ffe280a2b8bad0386be1052174a702f9499b615320ac043

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