Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eba3a7d191faee4…

MALICIOUS

PDF

69.5 KB Created: 2021-02-08 22:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ead036550e352eb13ce4b6f7c338bf0c SHA-1: e21cd9deb52816d4b9601ab8e23d5b0042c27456 SHA-256: 7eba3a7d191faee4eebcea350c8d1d19e40e112cb7c79179f7df9b1c531fe652
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a tactic of directing users to malicious websites, likely for credential harvesting or further payload delivery.

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://baarspo.ru/123?utm_term=8th+grade+social+studies+staar+review+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fe0fa8813644.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/fonev.pdfIn PDF document text
    • http://pejofewetoz.22web.org/fisewefedefeke.pdfIn PDF document text
    • https://kojelujozifani.weebly.com/uploads/1/3/1/8/131856125/nitemomoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5fe5a58c7621d.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/eca41.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/mevafela-vamiwozut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5ff6515c16866.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/9166412.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/bdf91b613420ea3.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/kajef.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/5069867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopimuriwunewok.epizy.com/32364921018.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/35090724698.pdfIn PDF document text
    • http://mobotifiriw.epizy.com/bidow.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/76912805201.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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 5452 bytes
SHA-256: 41f81e234a7411f63a8c8492c649e0ae817fad152bb79e37ebd01754ac68f43f
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10072 bytes
SHA-256: 2ae9a187e5992c36ececa3269e704306761b9aeaeafb7068ba379b6d99fcbf64

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